nothing in any other game i played felt more rewarding then just unloading on a chimera with a bullseye machine gun to the face. This game has it all, graphics, violence, cool gadgets, and of coarse, the blood thirsty alien race that would like nothing more than to eat for you for the christmas dinners main coarse. The games story line is that halos' couldn't match. although, it has a halo like feel to it. the co-op is insane and sadly, i havn't tried the online yet.
so take it from me, a die hard PS fan, this game is the ****