Well i played the HUGE demo last night. Took a bit of getting used to but ended up really enjoying it. It's a little bit arcadey what with slashing 30 - 40 enemy robots with a sword but it seems to have a nice story line and stunning graphics.
I think with a vast story, different places, puzzles to complete etc, it'll be a lot longer before i'm bored. You enjoy you're one on one fight after fight after fight though