I have all 3 games, plus cod4 and also gears of war. Out of the 5, i think i enjoyed gears of war and cod4 the most. UT3 is good for just getting in and blowing stuff up, i just cant get into crysis, i think i expected too much out of it and it let me down. Bioshock is ok, its really immersive, but my gamer ADD gets the best of me and i just cant seem to stick to it. I really liked the whole duck and cover aspect of gears of war compared to most FPS games.