I took my 9 year old this weekend and we both loved it. It is not just for kids -- in fact, I thought there were definitely things that very small children should not see. I've told my friends to take their school age kids, but to leave the preschoolers at home. We won't be letting my 3 year old watch it on DVD next year, for example ... not till he's older. It was PG for a reason.
There was *so* much here for adults, and especially for superhero lovers, LOL. The recurring bit about villains "monologing" had me ROTFL (and thinking of those lists that circulate on the internet about what Evil Overlords should not do), and the discussion about why capes were a terrible idea for superhero costumes was absolutely hysterical.
I was expecting this movie to be fun for kids, but I didn't expect it to be so intelligent. Great dialogue and the actors said their lines so well.
I've described it as part "True Lives", part James Bond, and part "Spy Kids". Put them together and you have a real winner.
Kathy