I had my doubts with Robert Downey Jr. playing Tony Stark, but I have to say I was wrong. He did a fantastic job and the cast in general was near perfect. The dynamics between them all worked perfectly, hats off to Jon on his selection. The story was great, I don't think I ever thought it was moving slow or was boring. The effects were amazing, it looked so real and not even close to lookinglike CGI. It was funny at times and had some really great action scenes that didn't go over the top, but were still able to keep you glued to your seat. This will probably be one of the best "Comic" based films of all times and IMHO easily beats Xmen, Fantastic Four, the first Hulk and rivals Spider Man if not slightly better. Again, I cann't say enough on how well Robert Downey Jr. did and how this proves that when he has it together he can be one of the best actors of all times. MUST SEE MOVIE!!!!