KH2's battle system is... okay, but it's way too easy. D: I wish they'd strike a balance between KH1 and KH2. I've been playing FM+ again lately and the only battle so far that has given me any trouble (ie didn't beat it on first or second try) is Marluxia's absent silhouette. :| And that's mostly because I haven't gotten the hang of this fight without glide yet. XD; (The last 3 years, every time I've fought him, I've had glide so it's an entirely different battle without it.)
Yeah, KH2 is waaay too easy. :( It's mostly just button mashing with the exception of a few battles.
COM's battle system is still my favourite. I must admit, though I really disliked it at first, BBS's is kind of growing on me too. |D