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If they fail i'll still have them lose the spell. Its also still an instantaneous reaction so you can counter spell a counter spell. If you are casting a 9th level spell and dont also have a counter spell somewhere to then force them to make a save too then thats kinda on you. 

can a 5th level wizard cancel a 20th level caster's spell? Sure. But when the 20th level caster makes you save to even cast that counter at a much higher dc it is a lot less likely.

You will no longer be able to cast Counterspell to counter someone who is trying to Counterspell a leveled spell you are trying to cast. (Only monsters will be able to that to you!)

On a turn, you can expend only one spell slot to cast a spell.

 

 That I missed and it is damn big change too!

 You may not be able to counterspell back but a Sorcerer can quicken the same spell that they tried to cast and use it as a Bonus Action due to them not used a spell slot yet on this turn. 

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Quote from GammaRaysForDays >>

If they fail i'll still have them lose the spell. Its also still an instantaneous reaction so you can counter spell a counter spell. If you are casting a 9th level spell and dont also have a counter spell somewhere to then force them to make a save too then thats kinda on you. 

can a 5th level wizard cancel a 20th level caster's spell? Sure. But when the 20th level caster makes you save to even cast that counter at a much higher dc it is a lot less likely.

You will no longer be able to cast Counterspell to counter someone who is trying to Counterspell a leveled spell you are trying to cast. (Only monsters will be able to that to you!)

On a turn, you can expend only one spell slot to cast a spell.

 

 That I missed and it is damn big change too!

 You may not be able to counterspell back but a Sorcerer can quicken the same spell that they tried to cast and use it as a Bonus Action due to them not used a spell slot yet on this turn. 

I wish. But that won't work either since the spell is still considered having been cast, just failed, with preserved spell slot.

Quicken Spell: When you cast a spell that has a casting time of an action, you can spend 2 Sorcery Points to change the casting time to a Bonus Action for this casting. You can’t modify a spell in this way if you’ve already cast a level 1+ spell on the current turn, nor can you cast a level 1+ spell on this turn after modifying a spell in this way.

Awful. Look how they massacred my boy. 

Quote from PeteInCary >>

Quote from Petejs93 >>

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Quote from PeteInCary >>

Quote from GammaRaysForDays >>

If they fail i'll still have them lose the spell. Its also still an instantaneous reaction so you can counter spell a counter spell. If you are casting a 9th level spell and dont also have a counter spell somewhere to then force them to make a save too then thats kinda on you. 

can a 5th level wizard cancel a 20th level caster's spell? Sure. But when the 20th level caster makes you save to even cast that counter at a much higher dc it is a lot less likely.

You will no longer be able to cast Counterspell to counter someone who is trying to Counterspell a leveled spell you are trying to cast. (Only monsters will be able to that to you!)

On a turn, you can expend only one spell slot to cast a spell.

 

 That I missed and it is damn big change too!

 You may not be able to counterspell back but a Sorcerer can quicken the same spell that they tried to cast and use it as a Bonus Action due to them not used a spell slot yet on this turn. 

 

I wish. But that won't work either since the spell is still considered having been cast, just failed, with preserved spell slot.

Quicken Spell: When you cast a spell that has a casting time of an action, you can spend 2 Sorcery Points to change the casting time to a Bonus Action for this casting. You can’t modify a spell in this way if you’ve already cast a level 1+ spell on the current turn, nor can you cast a level 1+ spell on this turn after modifying a spell in this way.

 I see what you are saying with it but to me it is that first sentence of Counterspell, 'You attempt to interrupt a creature in the process of casting a spell.' that may allow it. If you interrupt someone from doing something you stop them from doing it so they never finished the cast so didn't cast a spell. Feel like it could go ether way depending on DM.

Quote from Petejs93 >>

Quote from PeteInCary >>

Quote from Petejs93 >>

Quote from Dungeon_Of_Terra >>

Quote from PeteInCary >>

Quote from GammaRaysForDays >>

If they fail i'll still have them lose the spell. Its also still an instantaneous reaction so you can counter spell a counter spell. If you are casting a 9th level spell and dont also have a counter spell somewhere to then force them to make a save too then thats kinda on you. 

can a 5th level wizard cancel a 20th level caster's spell? Sure. But when the 20th level caster makes you save to even cast that counter at a much higher dc it is a lot less likely.

You will no longer be able to cast Counterspell to counter someone who is trying to Counterspell a leveled spell you are trying to cast. (Only monsters will be able to that to you!)

On a turn, you can expend only one spell slot to cast a spell.

 

 That I missed and it is damn big change too!

 You may not be able to counterspell back but a Sorcerer can quicken the same spell that they tried to cast and use it as a Bonus Action due to them not used a spell slot yet on this turn. 

 

I wish. But that won't work either since the spell is still considered having been cast, just failed, with preserved spell slot.

Quicken Spell: When you cast a spell that has a casting time of an action, you can spend 2 Sorcery Points to change the casting time to a Bonus Action for this casting. You can’t modify a spell in this way if you’ve already cast a level 1+ spell on the current turn, nor can you cast a level 1+ spell on this turn after modifying a spell in this way.

 I see what you are saying with it but to me it is that first sentence of Counterspell, 'You attempt to interrupt a creature in the process of casting a spell.' that may allow it. If you interrupt someone from doing something you stop them from doing it so they never finished the cast so didn't cast a spell. Feel like it could go ether way depending on DM.

Refer to this line in Counterspell: If that spell was cast with a spell slot, the slot isn’t expended.

This tells you that a spell that was Counterspelled was indeed considered as having been cast, even though the spell dissipated with no effect.

Quote from PeteInCary >>

Quote from Petejs93 >>

Quote from PeteInCary >>

Quote from Petejs93 >>

Quote from Dungeon_Of_Terra >>

Quote from PeteInCary >>

Quote from GammaRaysForDays >>

If they fail i'll still have them lose the spell. Its also still an instantaneous reaction so you can counter spell a counter spell. If you are casting a 9th level spell and dont also have a counter spell somewhere to then force them to make a save too then thats kinda on you. 

can a 5th level wizard cancel a 20th level caster's spell? Sure. But when the 20th level caster makes you save to even cast that counter at a much higher dc it is a lot less likely.

You will no longer be able to cast Counterspell to counter someone who is trying to Counterspell a leveled spell you are trying to cast. (Only monsters will be able to that to you!)

On a turn, you can expend only one spell slot to cast a spell.

 

 That I missed and it is damn big change too!

 You may not be able to counterspell back but a Sorcerer can quicken the same spell that they tried to cast and use it as a Bonus Action due to them not used a spell slot yet on this turn. 

 

I wish. But that won't work either since the spell is still considered having been cast, just failed, with preserved spell slot.

Quicken Spell: When you cast a spell that has a casting time of an action, you can spend 2 Sorcery Points to change the casting time to a Bonus Action for this casting. You can’t modify a spell in this way if you’ve already cast a level 1+ spell on the current turn, nor can you cast a level 1+ spell on this turn after modifying a spell in this way.

 I see what you are saying with it but to me it is that first sentence of Counterspell, 'You attempt to interrupt a creature in the process of casting a spell.' that may allow it. If you interrupt someone from doing something you stop them from doing it so they never finished the cast so didn't cast a spell. Feel like it could go ether way depending on DM.

 

Refer to this line in Counterspell: If that spell was cast with a spell slot, the slot isn’t expended.

This tells you that a spell that was Counterspelled was indeed considered as having been cast, even though the spell dissipated with no effect.

 I think at this point we are just arguing semantics and probably do not need to worry about this until the 2024 Monster Manual comes out as I am sure that there isn't that many creatures that can counterspell the players. 

I'd say we are just trying to figure this spell out.

It does not just affect monsters. It affects warlocks with their mystic arcanum, sorcerers with quicken spell, and players using scrolls, magic items, or feats that grant single cast per day for free. Probably more but these are just off top of head.

Sure, but I said the mechanics are not what matter to me here. My point it's that instead of being a magical superiority thing now it's just better to attack the caster 3 times

Quote from PeteInCary >>

I'd say we are just trying to figure this spell out.

It does not just affect monsters. It affects warlocks with their mystic arcanum, sorcerers with quicken spell, and players using scrolls, magic items, or feats that grant single cast per day for free. Probably more but these are just off top of head.

 Another good point. 

With the items you use an action to expend a charge and then the item casts the spell, the reaction requires you to see a creature cast the spell so you wouldn’t be able to counter a Wand of Fireballs or the like or at least that is how I see it. Spell scrolls are you casting the spell just without material components or a slot so I would say yes that would stop it. The rest are from the player so would be able to be stopped just depends on how other rules and features interact with that. 
Warlocks would loose the casting as it is a once per day thing and with it not being a slot you would still be able to cast a spell with your other action. 
Feats would loose the free casting but with the new feats saying you can cast the spells with slots you would still be able to retain the slot. Unless the feat itself says you can cast the spell without V, S or M as then you cannot be countered. 
The Quicken to me is the out layer here with how you read the wording. Does the spell still get cast but then stopped or is it stopped mid cast? If it is after then yes you cannot quicken or if it was a quicken that was countered then you cannot cast with your action. If it is mid cast then I would say yes you can quicken after as you haven’t cast a spell this turn. 
I was saying about monsters as we do not know what will have access to Counterspell or if it will be like the Alhoon where it isn’t a spell for them. If monsters do not have access to counterspell or their equivalent then the player will not have anything to worry about loosing their free casting. 

Might as well change the spell name to "Delay the Inevitable." So, for a 3rd level spell, you might just be able to avoid that Power Word Kill... for one turn. This spell has lost all value. At best you delay what's coming. More commonly, you just waste your 3rd level spell slots. You're better off just killing stuff with your Fireballs and Lightning Bolts. And this spell is available to warlocks? You think a warlock is going to waste one of their spell slots on this?

Quote from TimBengtsson >>

'which you take when you see a creature within 60 feet of yourself casting a spell with Verbal, Somatic, or Material components.

The wording here is weird. So only if a spell has V, or S, or M can you counterspell. Not if a spell has V and S, or V and M and so on...
This has to be a mistake, right?

 I came to understand it as "You can interrupt casting when it has at least one of these", so of course you can counterspell, when it has multiple components. You can not if for example you would want to counter some spell, which a sorcerer could remove it's only component with subtle spell and therefore there would be no signs that he casts anything.

The wording means if it has any of the three that means you can counter it. The lack of an and isn't a typo it just means that any spell that has a V, S, or M component can be countered. 

I think its to outline that it won't work on ability-based magic. 

 Goolock can't be countered on many spell so :

Level 3: Psychic Spells

When you cast a Warlock spell that deals damage, you can change its damage type to Psychic. In addition, when you cast a Warlock spell that is an Enchantment or Illusion, you can do so without Verbal or Somatic components.

And he can counter as well as other spellcasters, maybe even better now :

Level 10: Eldritch Hex

Your alien patron grants you a powerful curse. You always have the Hex spell prepared. When you cast Hex and choose an ability, the target also has Disadvantage on saving throws of the chosen ability for the duration of the spell.

This is... Not as good as the old version.

Which gives your party the chance of killing him before the next round.

Quote from TimBengtsson >>

'which you take when you see a creature within 60 feet of yourself casting a spell with Verbal, Somatic, or Material components.

The wording here is weird. So only if a spell has V, or S, or M can you counterspell. Not if a spell has V and S, or V and M and so on...
This has to be a mistake, right?

 It's a non exclusive OR. So any combination of the components is valid. Since I think there are no spells without any components they could have left this out.

Quote from NewLahagan >>

So in my understanding the spell caster doesn't loose his spell slot if successfully counterspelled and had used a/his spell slot but the counterspeller looses a 3rd level slot ... only to win one single round. What the hell should be the reason for me to use counterspell at all? There are only very special conditions where it makes sense ... the spell is weakend and far to expensive for the small benefit remaining. Other meanings?

  Winning one more round could decide over die or not to die. So yes, I think Counterspell is a kind of last resort, if you are on the edge of a tpk.

"Power Phrase: 'Try Again'"

Most of the spells are straight upgrades, but counterspell was fine as it was