I thought it had just the right amount of challenge. Some bosses were actually hard, and FFXIII hands down has the most difficult final boss fight, mainly because the game won't allow you to get so powered up that you kill him in three turns.

I dunno, I really love the battle system in this game. I just wish I could control my entire party, or at the very least have some sort of gambit type system where I can tell my characters what to do.