Kids films may not be his strong point (spy kids, shark boy) but when it comes to making over the top action movies, few have the style and finesse of Robert Rodriguez.
Apparently, this was made while he was also shooting Spy kids 3!
This doesn't make OUIM any less great though.
The characters are as over the top as the action, the music is great (also by Rodriguez) and the visuals are stunning.
Intelligent? no, not really...just a great fun movie, best watched with a few beers and a few friends.