This is the best RPG related manga I've ever read, the art style is crazy(in a good way) and the charecters are something to admire more than the plot itself. Now for the Pros and Cons.

Pros: Great charecters, great plot, incredible action, good use of shadding and is great it when it comes down to great clothing styles and very original weapons, such as the Keyblade.

Cons: The plot is a bit cliched, the humor isn't all that great and the dialouge, just plain stinks.

Overall Kingdom Hearts is a great read, but with a few drawbacks.