Psi ops was definately one of the best games i've played this year.
It's physics based gameplay even spoiled half life 2 for me, and actually felt much more open ended (there are places which allow you to stack up boxes to reach areas you're not supposed to reach until later, no invisible barriers here, generally. By combining telekinesis, pyrokinesis, mind control etc you can build an unlimited number of strategies to dispose of the enemies).
A 10 in game mechanics for me; with better artists, better characters and storytelling psi ops would have been a masterpiece. I wish they had better artists working on it, turning it into some kind of Akira, or something similar to one of those ESP based anime or whatever.
A great game which was largely underestimated because of its generic western 3rd person shooter look.