I've managed to get myself into the first KH game, and so far have been enjoying it. The idea of crossing Square with Disney was amusing. However, my only gripe with it so far is the frequent battles, it's like Dynasty Warriors or something. But other than that, pretty solid action-RPG, though probably not the best in the genre.
So what have you thought of it? Good? Bad? Mediocre? Overrated? I usually ignore hype and take everything with a grain of salt before playing a game.