Quote from fdcorte >>

The way the new version is writter, at high level play — specially on monsters that can use it at will — can stunlock PCs that has low Wis saves. The adult red dragon, for instance, can cast it on 4 creatures per turn, at will, on a DC 20 save. As the system doesn't naturally scales every number, it's pretty commom for some martial classes to have a +1/+2 Wis save even at level 16-20. Playing by the book, I prevented two players from taking turns for three turns straight, making a combat supposed to be epic very frustrating. 

While I appreciate the players' frustration, I would argue that it's not unreasonable for an adult red dragon to magically hold off unwise adventurers for 18 seconds. To me, that's the beginning of many classic dragon fights in fiction, as would-be heroes who aren't particularly clever are (at least initially) outwitted and outclassed by the dragon.

Quote from SagittusRectus >>

Does "approach" provoke opportunity attacks?

Yes. You provoke opportunity attacks if you move out of someone's reach using your own movement or actions, even if you're compelled to do it by a spell like this.

Then this is always going to be a powerful 1st level spell, regardless of the wording tweak. All these commands are situationally useful. Grovel is about as useful a Otto's Irresistible Dance (for one round anyways), and that's a Lev 6 spell!

"NOT" Broken at all

Here's my issue.  The command HALT used against a Barbarian.  A Barbarian's rage ends unless they 1) make an attack roll, or 2) cause another to make a saving throw, or 3) use a Bonus Action to extend the Rage for another round.  So, RAW, the Halt command would cause a Barbarian to drop out of Rage.

Also, would the Berserker subclass Barbarian's level 6 immunity to Charmed and Frightened have any effect against Command?  Either full immunity or at least Advantage on the WIS save?

Quote from Dan01304 >>

Here's my issue.  The command HALT used against a Barbarian.  A Barbarian's rage ends unless they 1) make an attack roll, or 2) cause another to make a saving throw, or 3) use a Bonus Action to extend the Rage for another round.  So, RAW, the Halt command would cause a Barbarian to drop out of Rage.

Also, would the Berserker subclass Barbarian's level 6 immunity to Charmed and Frightened have any effect against Command?  Either full immunity or at least Advantage on the WIS save?

That's correct, the Halt command would end Rage. (This would've been the case under 2014 rules too.)

This spell doesn't apply the Charmed or Frightened conditions, so immunity to those conditions doesn't have any effect on it.

These designers are awful. They removed the creative aspect of this spell and the logical restrictions in favor of dumbed down multiple choice. Please stop treating us like morons.

So is the command you give (Approach!, Drop! etc) the Verbal component of the spell, or are those two separate things?

I.e. does the caster go "abracadabra Approach", or do they only go "Approach!"? This could make a huge difference when you use  the spell in a social encounter; if others don't know a spell was being cast (there not being any Somatic or Material components needed).

Quote from Reinder >>

So is the command you give (Approach!, Drop! etc) the Verbal component of the spell, or are those two separate things?

I.e. does the caster go "abracadabra Approach", or do they only go "Approach!"? This could make a huge difference when you use  the spell in a social encounter; if others don't know a spell was being cast (there not being any Somatic or Material components needed).

It's two separate things.

This was clarified in the context of a similar spell in Sage Advice here: https://www.dndbeyond.com/sources/dnd/sae/sage-advice-compendium#SAC-Spells-Suggestion1

Quote from Azlan >>

These designers are awful. They removed the creative aspect of this spell and the logical restrictions in favor of dumbed down multiple choice. Please stop treating us like morons.

They're not treating us like morons; they're treating us like we're going to exploit the functionality of an already great level 1 spell, and that's because a lot of players will try to. You've seen the jokes, you've heard the stories.

I’ve run games for over 30 years. I’ve seen every variation of shenanigans for this spell. Sure, some of the more “creative” commands were stupid or sick, but they gave us stories, and a decent GM can shut down the inappropriate nonsense after a laugh. Now it’s just boring, vanilla-flavored, annoying, and overpowered. 

Reminder for all DMs that "rule of cool" still trumps everything and you can absolutely rule that any verb is an allowable command.