It was decent. There were a few too many pop-culture references and I feel that the monsters could have been more fleshed out, but I liked most of the non-topical humor and there were some good action scenes.
Funny thing is that when I saw the trailer, I thought the movie looked horrible. Then my brother saw it on a whim and convinced me to check it out. It's no Kung Fu Panda, but it's no Space Chimps either.
