Well, I planned to do a really well-thought out review. Except that I never did. So... Sky High. I liked this movie a lot. Basically, if you have some fondness for goofy silver age type superheroes, you will too. If not, you'll complain about bad acting and effects, like some of the mainstream reviewers did.
One of my favorites (not mentioned earlier) was people complaining about the super kids not getting drunk at a party scene. Because, you know, the kids of the super hero protectors of the world are all gonna be gettin' drunk and peelin' off their clothes all the time. Sigh.
Anyway, if you like silver age heroes, and if you like Bruce Campbell or the Kids In The Hall (who have good parts-well, two Kids), go fo for it.