I agree that we could use some more original characters, but I don't see why we have to take out more FF and Disney characters. I actually wish we had even more. The FF and Disney mix is what Kingdom Hearts is. Taking away that would make this no different than FF.
The reaction commands were cool to watch and it was one of the main reasons the game got such a high rating, I don't think they should get rid of that.
I said this once and I'll say it again, but I love swimming underwater as a mermaid and the mini-games in KH2 actually have a replay value, so I can't complain with that either. I loved both those worlds. Besides, Alantica's purpose on KH2 was for pure fun and I enjoyed the little music game in Atlantica. Let's not forget that flying was one of the most enjoyable part in KH1, which is why Peter Pan's world has to be back.
This game does need to be longer though. It was longer than the 1st but it was still quicker than a mud. A lot of the time was cutscenes too. At least the cutscenes weren't as long as Star Ocean's or as boring.
I would also like multi-player. I know that's kinda hard to work out but they could do it justice if they work on it. Nothing would make me happier than to kill heartless with my best friend.
I wish the smaller characters would have a bigger part (Selphie, Olette, Hayne, Pencer, Setzer, Seifer, etc.) and a lot more playable characters.
The worlds weren't as big as Tetsuya hyped them up to be. Sure, some worlds were kinda big, like the Underworld. But some worlds were split up in like only 3 or 4 areas, like Pride Rock.
I miss the Tinkerbell summon badly, but I guess they did that because of the whole healing issue.