Never been a particular fan of Disney (as in straight Disney, not the mass of stuff they also own and stuff out of whatever brand suits their needs) here either, still love me some Capcom style 8 and 16 bit era games featuring characters from Disney properties.
Still I tried Kingdom Hearts to see what the fuss was about. Controlled barely acceptably, story in general was nothing to write home about (not that slash fiction often manages that) and gameplay challenge/design was also in the just about acceptable world for me (and I usually like PS2 era stuff). I could play it but would forget it 5 minutes after it was done.
I had similar things for Monster Hunter (on paper it should be pretty enjoyable, and seems to have a fairly big fanbase that claim to like the sorts of things I would like in this), though to this day I have not put anywhere near as much effort into Kingdom Hearts as I have put into Monster Hunter trying to see if I can get it to click.
Sitting here thinking what I would have to hack and redo to make it play well for me just sees the amount of work to be done far exceed my usual "tweak growth curves, nerf a bad/pointless mechanic, add an extra pickup/default something in the inventory, change some text and graphic design, maybe change an AI behaviour, maybe change controls in a subtle way" type thing. It could be done, and would recognisably be Kingdom Hearts at the end of it all, but it is not effort I would care to do as the end result would be matched by other things which I would spend the same amount of time on, and gain far more from.
Normally I rate games based on wasted potential, and find the worst games to be those that fail to live up to it (see also Monster Hunter). Kingdom Hearts is not that to me; I just see it as fluff really, albeit fluff that has entranced a fairly considerable fanbase.
I still maintain (
http://gbatemp.net/threads/zelda-vs-the-term-rpg-august-2012-edition.332154/ ) it could classify as one. If I have to count Japanese games where you play no kind of role of your choosing/trying to be in line with a character as RPGs and make no meaningful decisions then story and setup tracks, you gain improvements to your character as you go through the game (it is a bit more abstract than experience and levels but it is there) and can choose your setup to go out into the world with.