Deku's personality has changed too much. He is like a completely different character, maybe that's the previous OFA users influence, but it's still jarring. I don't mind Deku becoming darker in character, but he has not personally suffered any event that would change him so totally. Horikoshi should have had the balls to kill off Deku's mom or even All Might during the war, then it would have been more explainable.
I miss Shoto and Bakugo and want to see them in action already!