I think its a GREAT movie, BUT, there is a lot of violence that I don't think is appropriate for some ages. It may scare them or make them cover their eyes. It can be a great family movie and a lot of fun. Its a wonderful comedy and a must have around the house.
Whats with the PG-13 rating? this movie is clearly fine. if you want something more adult-like, watch kung fu hustle. it has most of the same cast and crew from this movie. not bad except for one seen where a guy makes out with another guy. its not as bad as it sounds, try it out yourself and see if you would like your kid to watch it.