I never had a chance to play the original game back when it was released. Square did a pretty good job updating it for as old as the game is. I can see why people liked it. It's off the wall strange.
The PS3 package includes three things. Kingdom of Hearts Final Mix, Kingdom of Hearts: Chain of Memories and Cinematic story videos from Kingdom of Hearts 358/2 Days.
For what it is, the game looks great in HD. Very colorful world. It's old school with zero help on quests. I can't even find anywhere that tells me even what quest I'm currently on much less any guidance. Took me awhile to figure out where to get the god damned yellow coconuts. The controls/menus are also old style, so not the best. It harkens back to the days where you had to repeat platforming moves 10+ times to get it right.
For anyone that has fond memories of the original, here's what it looks like in 3D/HD:
http://youtu.be/6evXfWypM2A
It's the most oddball thing I've ever seen Disney characters be involved with.
Kingdom of Hearts HD 1.5 ReMix (PS3)
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