I'm about to start a new game where I'll be playing an Eldritch Blasting warlock (Tome/Raven Queen from Unearthed Arcana). At first I was afraid it would be boring because I'd be doing the same thing over and over. After thinking about it though, that's no different than most melee classes - swinging that sword over and over. Your battle master is going to do the same thing over an over aside from limited use of maneuvers - same with a Warlock, blast blast blast and limited use of spells and invocations.
Who doesn't love being the Eldritch Sniper: popping heads from 600 feet and sending the bodies flying back? I don't care if I have to cheese the feats system and use half of my invocations to do something this situational, it's still awesome as all get out.
Honestly for me it was a really nice ease-in to casters as a newer player. Going full caster like Wizard or Sorcerer made each turn take forever as I didn't yet have the experience or the confidence to just pick a spell and cast it. Starting with some of the flexibility of spells but for the most part just EB EB EB EB EB until everything explodes was a fantastic middle point. I will always love it.
I originally saw my Warlock as more of a magic using spy. I quite enjoy the tie in to illusions and fairy magic with the Archfey patron. But as discussed here all of the Invocations and Spell Sniper shenanigans I don't mind being the first volley in a fight! Putting the war into warlock. I do like that UA Hexblade Warlock is a thing as well. I think it'll make the mix of ranged vs melee warlock at tables a little more varied. There were times over the last couple of years where I felt that maybe it's just too easy, but then it became a guilty pleasure. Rolling my beams and adding that CHA makes me think that Kith, my half-elf warlock, just slyly grins hoping a 20 rolls up on that die of fate.
My group gets together so infrequently I haven't had the opportunity to EB anything yet :( Looking forward to it though! I took The Wild Hunt homebrew patron and will be EBing from a rocking hand crossbow. Pew pew indeed, sir
I've heard some people complain that warlocks are a one-trick pony. Maybe. But so is my archer ranger. Don't let the one trick be one trick. You can flavor the EB any way you want. Maybe it changes color or form based on your mood, or your enemy, or the environment. Actually kind of jealous, as there's not as many ways to spice up a bowshot. ;)