I found the game to be highly unstable, especially when using an Xbox360 controller.
Graphics wise, everything is nice provided you have a decent enough gaming rig, I personally read plenty of posts in the forums about lag etc, so far when I've been actually able to play the game without crashing, I've had little to no lag at all, everything has been smooth and responsive.
This game needs some major patches before I can give this a proper review, as it stands right now...I have a coaster.