Saw Iron Man tonight - Was very pleased but they could have shown 3 hours of green screen and I would have been tickled. I am a Marvel fanboy and a Robert Downey fanboy, so I was screwed!
The only complaint I had was that the CG was really antiquated. There is a chest scene between Paltrow and Downey where she plays "operation" where the cgi is so bad I laughed out loud. But all-in-all the casting was spot on. Favreau (director) and I must be blood brothers considering the placement of props: old airplane antiques, hot rods, jukeboxes, some other more personal stuff. Kinda weird actually. Like he was stalking my apartment.
B+/A- on the effects, A on the story and A++ on the casting. Can't wait for the sequel(!)