I guess because he rekt ultimate universe with his dogshit writing. You may not like ultimate in the first place for the tone or whatever, but he just pissed on anything previously established, like characterization. Ultimate was pretty tight before. He was like drunk, intoxicated Bendis going for the damage purposefully.
How bizarre it sounds, but he totally raped the unliekly good that came from Millar.
I got over it years ago, I'm just saying.
Also, red hulk is retarded in concept and execution.
I tried some of his acclaimed stuff and it was meh.