Because Superman fans turn around and flame the Sentry for the same thing. That, and I like characters who have flaws beside a super rare radioactive mineral, and magic. Neither of which are in heavy supply around Superman it seems. Where Hulk's intelligence can ALWAYS be used against him. How hard is it to lead the Hulk away from a populated place? If Superman went rogue, you could just call him names and run, but chances are he'd just go back to destroying things, and not falling for easily put together traps. Hulk is just dumb, you can make a pit, cover it with obviously different colored leaves, and he'd STILL fall for it. And Hulk can't just fly out of a situation, if he were in a sand pit, he's stuck in a sand pit, effectively just stopping an otherwise unstoppable character. Where Superman could just shrug that off and get out, and heat beam you for it. Hulk is just pure strength, pure durability, and low intelligence, that's it. Tons of limitations and problems where he actually has to work around. Not saying Superman has zero limitations, it's just he has tons fewer. If it's a heat guy, freeze him, if he needs air, suck all the air out of the room, if he can't fly, drop him from a huge height, if he's just really durable, punch him out, if he's some cold guy, fry him. And he can see through things and stuff, and Superman's suppossed to be some sort of genius and such. So most enemies he comes across shouldn't even be able to outsmart him. That and Clark's life is relatively easy and carefree, where Bruce has to deal with the Hulk all the time as an affliction.