A good RPG for the Gameboy Advanced
Graphics: The game looks pretty. It has FMVs! And decent ones at that too. The characters, and the enemies look very nice. The backgrounds are great. Overall the graphics are great.
Sound: The music is very good. I think I will leave it at that.
Gameplay: The gameplay may seem strange in the beginning. But you will soon get used to it. And then it's not bad at all. It's actually pretty fun. Not to mention that once you finish the game with Sora, you unlock Reverse Rebirth Mode which is basically going through the game backwards with a TON of story with Riku.
Story: The story is decent, and it starts off where Kingdom Hearts one left off.
Overall I would say this game is worth buying, just because of the fact that it is fun, well designed, has a decent storyline, and is replayable at least once on the reverse rebirth.