I think RDJ will play a good Ironman. I never really read any comics, but after hearing about this awhile ago and hearing their choice on RDJ, I read a bio on Ironman/Stark and I think he will play the character well. In the comics Stark has an alcohol and drug problem that he deals with. DING DING DING!!! Plus he is real cocky at times. Almost anyone can play into that, but in the trailor, you can see RDJ doing that very well IMO.