I found COMs music to be the best out of all 3 games. It had perfect remixes of the KH1 songs (Destiny Islands theme was fantasticly done), and the new songs for the Organization battles were really good.
Online mode would definetly be a fun mode to add, and would give some more replay value. I'd love to see a "Hunt" mode where you and 3 other players on Wifi can look for and fight each other. Unfortunetly, i don't think they're gonna include an online mode for this game =/