The world gives a nice vertical element to Kingdom Hearts, even if Sora seems a little slower than normal. The ocean world breaks up the style of gameplay enough to give a new and interesting gameplay. But it seems like people don't like it much, why is that?
Kh1 atlantica was a hell hole water level with janky controls, kh2 atlantica was an ungodly abomination of quick time button hitting and cringe Disney sing songs.