Just going to put in a quick take and re-visit after sleep:
Warlock is disappointment on the whole. They've got some good ideas, but many of them are locked behind needlessly niche combinations. Like the cloak of flies that deals poison damage, could that also not work for feylocks with a swarm of tiny faeries or something?
Hexblade sucks. Period, in my opinion. I find it super uninspired lore-wise "hey guys, remember those iconic weapons from way-back-when?", but it's also an incredible stretch to me from a concept point of view. Like if blackrazor is so powerful it can gift a full class-list of abilities to some dude, then clearly it could find some way to be ambulatory or stop being a sword. Not to mention it steps on the bladelock's toes.
Raven queen is also sub-par, but that's just because I find her theme conducive to edgy players and we don't need more crap dealing necrotic damage.
Lore wizard is awful from a balance perspective I think, it's way too flexible, and gives way too many ways to nova. They can tailor all their spells to exploit enemy weakness or dodge resists, amp the damage further with spell slot use, and as others have pointed out, have a largely un-answerable range advantage, though I think that will be the most niche of their stuff. Oh yeah, and they can select the enemy's worst saving throw, in a game where high level saves are already borderline impossible, and they can increase the DC by a further 2 if they really want it to stick. Ridiculous.
Master of Magic is also a huge problem, I seem to recall that pathfinder had a very popular power-build centered around basically this ability, because it might as well be a 1/day problem solver, since you can tailor your response to the situation from any spell list in the game. Which also means that it is hilariously power-creepy by default, as just with prior editions each new spell resource gets added to the wizard repertoire as well.
All in all this might be on of the worst UA's they've released in my opinion, what little I did enjoy is tarnished by its implementation.