I understand fans love of the Savage Hulk. However, how can you expect a character as abused as the Savage Hulk to remain childlike and innocent forever. He may have started out niave and childlike but children learn and their personalities change in response to their environment. The Hulk's environment has never been the most nurturing.
I think Green Scar is a natural evolution for a character that is constantly feared, mistrusted and abused. Should it be his personality in the Avengers?
I would like to see at least some cunningand growth in the character but I think full blown Green Scar would miss the mark. Maybe down the road.