I liked this movie. It's one of the best superhero movies that has come out in the past ten years (and trust me, there have been a lot). Downey Jr. pulls off Tony Stark nicely, and the effects actually look good instead of cheesy. The purpose of Iron Man is to entertain you. Go check it out, it's a lot of fun.
Besides, how many movies have an automatic spot for Ozzy in the soundtrack?