Are you purposefully trying to get me to use my anger and turn to the Dark Side?
That’s a toughie though...
I’d say at the top would be Ahsoka, as she keeps on appearing in Disney Star Wars media when she really should have been executed during Order 66. If her appearance in Rebels and her return in Series 7 of the Clone Wars weren’t enough, now she’s also going to blight series 2 of the Mandalorian, before I’ve even had the chance to see the first one! FFS Disney...
Second I think goes to Vampire Counts because GW clearly should have deleted them and kept Tomb Kings. There’s a massive fan base for Tomb Kings out there that now can’t get many decent models while every other fantasy wargames company under the sun makes traditional undead, so VC fans aren’t exactly short of alternatives. GW were mad when they made this dumb-ass decision.
Third goes to Witch Elves because they’re far too damn powerful for their own good, and were made a Core choice in 8th Edition, but they have no defence against a good Organ Gun or even a round of shots from Thunderers.
Finally Weasley is the least offensive to me because many TNG fans had the sense to complain to the writers and the writers had the sense to phase him out more and more. He’s still insufferable though in the episodes he does feature in.
I might ask you the same question: Which is the worst? Kathleen Kennedy, High Elves, Rian Johnson, J.J. Abrams, Beastmen, Rose Tico or Jar Jar Binks?
The HPA is damn good and really holding its own against some very stiff competition. Come to think of it, for a guy who complains about the Warriors of Chaos being OP, you do own arguably 2 of the 4 strongest armies in the game (High Elves and Skaven).
I don’t really see those armies as being super-strong compared to WoC. Perhaps it’s because I principally play with what looks cool and thematic in those armies (as I do in my other armies) rather than what’s competitive, as I don’t have a Frostheart and don’t use Banner of the World Dragon with my High Elves and my Skaven don’t have a Hell Pit Abomination.
Another reason is that both High Elves and Skaven have vastly inferior Core choices to Chaos Warriors which can easily be destroyed by shooting, and their strongest units are in the Special and Rare categories and are thus balanced out by the fact that you can’t have an entire army of them and they clash with other Special and Rare choices. The Hell Pit Abomination is an especially good example of this as it’s a Rare choice and thus forces you to choose between it and other good Rare choices like the Warp-Lightning Cannon, Plagueclaw Catapult and Stormfiends. It is certainly entirely possible to have an entire army of Chaos Warriors on the other hand, and players can easily field large deathstar units of 30+.
Your roster of armies of, High Elves, Skaven, Dwarfs and Orcs & Goblins, are stronger than my ensemble of Warriors of Chaos, Chaos Dwarfs and Tomb Kings.

Maybe I'll have to trade in my Lizardmen for some Dark Elves to help even the score
If you did that you’d also have to forfeit your presence on this forum (only Lizardman players allowed!), and I imagine you wouldn’t want to risk anyone stealing your lead in posts and likes
(and no, I'd never trade away my Tomb Kings, even though they are by far the weakest of the armies I own).
I would never ask you to commit such a travesty to the superior Undead faction (even if they are ‘only’ superior lorewise and modelwise). They need all the support and love they can get as GW no longer gives them any!