Robert Downey Jr. is excellent. The screenplay is good, and the action is tremendous.
Any fan of action films or comic book adaptations has to see this film - at least twice.
Jeff Bridges plays Tony Stark's partner. It's really weird seeing The Dude playing an arms merchant. Also weird seeing Gwyneth Paltrow playing the demure assistant type. But Bridges is much weirder.
Anybody who sees this needs to stay through the end of the credits for a neat cameo.