Loki
Half the show show was the writers saying "um actually they couldn't have done anything except the dumbest things possible in endgame because of the sacred timeline obviously. Why didn't we do anything to hint at that before now? Shut up." other half was butchering anything interesting about Loki.
Speedruns his character development episode 1 so he's now the Loki everyone currently knows, taking away any sense of consequence from his death.
Refusal to use his magic for any fights, absolutely ridiculous how the original avengers level threat is easily taken out by glorified cops.
Female Loki is an entirely different character because they can't acknowledge Loki being gender fluid more than a blink and you'll miss it moment.
The trash dimension place was pretty cool though props for that.