Rave was the biggest disappointment I've ever watched in anime. I have cited the same problems with it as Get Backers, only Rave is much much worse, much worse. Not only did it insult its own charm of fantasy, which by the way at first impressed me and also was the reason that it became a bigger disappointment, it's character development is the worst I've seen so far. So bad to the point that the exaggerated emotions shown by its characters can be almost be considered as corny.
I've never read the manga, though, so it might be a different story there.