Overall a game that needed a couple more months of polish to really shine. Definitely enjoyable if some technical issues arent immediate game trashers for you.
I agree with dark10x, if you have a gaming worthy PC, slowdowns/glitches suddenly do not become nearly as big a problem as in the XBox version (which gives AR it's bad image IMO). I recommend the PC version.
Advent Rising is absolutely awesome. I like it more than Demi does (yeah i said it). The game could have used a couple more months of work though. It can get kinda choppy at times, but it never hurt my fun playing it. The story is really cool. The soundtrack rocks.
I really hope this game gets the green light for the rest of the trilogy cause it sures sets the second game up well.
And the powers you get OWN Psi-Ops (another game I really liked).