The show is DEFINITELY an older kid's / young adult's show. There's religious sides (which some viewers may find offensive) and a LOT of violence.
For those who haven't seen it yet: there are a lot of scenes that are fast-paced and thrilling (usually fight scenes), and then the very slow, more chick-flick scenes that are sentimental with the music in the background. But the graphics are beautiful, and it's a great show.