What makes you think that was him at his angriest? He had five years of being fat and useless, he probably still had lethal-level blood alcohol content at that very moment, and he had already killed Thanos once with devastating psychological results which could easily mean he was a bit self-hindered the second time around. It would be tough to believe that Thor would be at his best in that fight.
It's funny that at least two people in this thread already said they were upset that Scarlet Witch was nerfed....you can't please everyone.
There'd be people upset unless Thor, Hulk, Black Panther, Drax the Destroyer, Captain America, Ironman, Scarlet Witch, Captain Marvel, AND Howard the Duck had all gotten to kill Thanos one-on-one.