I thought it was good. I only have two very minor issues and they are -
spoilers: (sorry, dont know how to do the gray area thing)
1. Didnt like how quick he changed into the Hulk before the battle. Would have been better if they slapped him around a little to edge it on.
2. Didnt like how Tony was practically dead and got woken up by the Hulk screaming at him. Seriously? Should have just had Thor shoot him a little with some lightning or something.
Thats it, my two little complaints and thats it. I can live with those.