A tremendous amount of fun. Robert Downey is a blast to watch and watching him build the Iron Man suit both raw-dog style in a cave and hi-tech with Stark Industry’s 3-D GUI is worth the price of admission.
Far and away one of the most enjoyable comic book adaptations I’ve seen, Favreau keeps it light and fun. The only complaint could be that the final battle seems a little less-than-epic, but how much screen time can you devote to two robo-men banging metal at each other? The Tron-inspired/Sabbath-tuned closing credits are neat, too.