Eh, Kingdom Hearts strikes me as a series that has no idea what it wants to be or who it wants to appeal to.
The Disney characters and simplistic themes (Friendship is good! It's really really good to have friends! Friendship!) make it seem like they were aiming for a very young audience, but the needlessly convoluted plotline (remember, convoluted /= complex) and Final Fantasy element are completely ill suited to that.
I guess that's inevitable when you try to make Crack Fic: The Video Game.