Great flick! And ... hang out for the extra time past the impressively long list of credits. It's worth it if your are a Marvel fan in any way, shape, or form. (Oh, and of COURSE Stan Lee is in the movie. Keep your eyes open.)
I think this is the best role I've seen Robert Downey Junior in, in a very long time. I think he had a lot of fun with it. (Though I really liked him in Charlie Bartlett.) And, boy was he buff!
Jeff Bridges did really well with his role, particularly towards the end of the movie. If I told you any more, I'd have to issue a spoiler alert.