Ok, Downey give a good all round performance in this film, changing from the spoiled weapons merchant to the crusading hero without any real awkwardness other than what was meant to be seen in the story.
The humour used in parts such as him first developing how the second suit will fly was almost Nickesque and caused laughter through the cinema.
Paltrow's chaacter could have been used slightly more but I suspect that this film was more to introduce her as well as S.H.I.E.L.D.
Overall its an enjoyable film that will appeal to both younger kids who want to see a superhero film and bigger kids (like Baldymort) who grew up reading the comics.