Bana was good, but I do think he acted it exactly how he was told to.
While this isn't a BAD thing, I think Norton can actually add some kind of improv to it, something a little more believable.
He's done the multiple personality thing before, and he's not gonna actually have to play Hulk.
I hear Abomination is in this one. If they make the fights few and far between, it'll be much better, much more impact.
-AC