Here's a look at the battle system, and it just doesn't seem that compelling all on its own, but could just be me.
That demo is of a much earlier version of the battle system which the developers have said numerous times is not fully reflective of the actual game, so much so that if there were to be a demo for North America they wouldn't be able to release that same demo. Plus the entire purpose of releasing that demo a year before the game's release was to asses fan feedback.