They completely fukked up Ultron. And I'm not some comic nerd....I haven't read a comic since the early 90's. But they changed his character for the worse, seemingly for no reason. Had him cracking jokes and shyt. It was super corny.
There's a bunch of other reasons but the best way I can sum it up is I felt the theater thinking "they could've kept that". Which is fine for....like, "Thor: The Dark World" or "Ant-Man & The Wasp"....not for an Avengers movie. Cap saying "Avengers assemble!" >>>>>>>>>>>>>>>>>> the entire run time of "AOU", and it's not even close to me.
Fred.