I believe that the new disney projects like the princess and the frog ect lack that 'magic' which made movies like the lion king , tarzan ect instant classics. So when i play KH I feel that magic so I believe the reason why Kingdom Hearts is successful is because it has the classical disney magic. I just made this thread to see what people thought about my point of view.
I would think that it was successful in the gaming community because of the FF element. Story and gameplay don't hurt either.