I absolutely hate this decision, hate it, Norton wasnt spectacular or anything in TIH, but thats because he hardly had anything to work with, given more to work with he could have made an amazing Bruce Banner and now marvel go and just get rid of him and expect us to accept yet another actor in role(I actually liked Bana in the role too).
Not only that, but the future of Hulk as a character is right up in the air now, I honestly think the rumour that they intend to kill him off in Avengers may actually be true.
Marvel dont seem to have a clue what they are doing, from their Fox-like behaviour on TIH, cutting down the run-time, etc, to replacing Terrence Howard and totally rushing IM2 (which I found to be dissapointing).