It's been a really long time since an adapted Superhero story managed to both make a good, exciting, fun movie and stay true to the characters. Iron Man is the new bar against which all future superhero movies must compare.
Robert Downey Jr. is the best fit for his role in the history of the Genre and we very quickly understand the character as he struggles with realizes who he was and who he should be.
The action sequences are very well done and the CGI is flawless. The final perfect touch is the well blended humor in the story.
Fans of the Comic Series will be very pleased. Especially if they stay to the end of the credits. Hint: Samuel L. Jackson is not in the first 2:05 of the movie.