Good:
Organization 13 Battles-Axel,Xaldin,Xigbar,Demyx,Saix,Luxord,and Xehanort
Gummi Ship improvement-More space,and you can customize your ship a lot better
New Summons-Stitch,and Chicken Little
New Worlds-Port Royal,Pride Lands,Tron,Disney Castle,Mulan,The World That Never Was,and Twilight Town.
Drive Gauge-Final Form,Valor Form,Wisdom Form,Master Form,and Heartless Form.
New Keyblades-Gull Wing,Follow The Wind,and many more
1000 Heartless Battle-Whats not to like about it.
Mickey Usage-Mickey can help you fight in some battles.
Bad:
Organization 13 Battles-Luxord cheats,and Demyx can sometimes be hard to beat.
Gummi Ship-Whats the point of using the dash thing when you cant even use it in a battle.
Drive Guage-Sometimes you can get easily killed and you cant heal your self with some forms
1000 Heartless Battle-The Heartless dont really put up a fight and they only have 2 different types fighting you.
Mickey Usage-Its hard to heal yourself with the light power thing cause you get hurt.