Sadly, we don't know yet --- as it sadly
hasn't been released yet.
The release date February 27th, I think. If I remember the date correctly, from Bioware's Jade Empire site. If you go to Bioware's site, you can see a cool video trailer for this game, which really make the game look quite good.
According to the X-box players, adn the reviews, Jade Empire for the X-box was pretty good. I'm sure the PC version will be the same...