If you were to go out in the year 2000 and buy two games, for instance Final Fantasy VII and Donald Duck Going Quackers and wonder who could ever put two such things together, well, somebody did.
Kingdom Hearts is the best game ever. It employes an easy to understand battle system which creates new ground and enhances old ground left by games like Final Fantasy VII.
Being in a game like this is great. Being completely surrounded by a dark fantasy only to be brought out of it by Disney characters like Goofy and Donald Duck.
Kingdom Hearts is the best game out there bar-none.