I remember seeing this now! I was searching for images and I thought one of the avatars was a Fiona avatar from Vindictus. This game's pretty badass, although I think the gameplay in that video you posted seems quite slow. I'd like to suggest an alternative: http://www.youtube.com/watch?v=-x60Hx5hE9I
This video convinced me to play this game.
I fucking hope this turns out better than Vindictus. I hated grinding.