Summary: For the type of game that it is, it's excellent. Much like Doom 3 and Prey, it's got good guns, fast gameplay, smooth controls, and a dark sci-fi/horror story. Even though it's a bit older and I'm just now getting around to playing it, it's still a lot of fun. I can't complain about the price either. You can normally find it for around $10 these days, which is a steal for any decent game.
Summary: LAME! I loved QUAKE version on the computer! So, I bought this for the XBOX. This game is buggy. It freezes at different points in the game, then the save feature does not alway s work. Very frustrating having to spend long periods of time walking back through chapters. The graphics are choppy. This game is like a high school student project compared to even the first version of HALO! It's lame, I returned it, DON'T BUY IT!
Summary: Love this game, great first person shooter, lots of different changes of scenery, not a huge fan of gore, but it fits with the game and it's exciting to play, and the storyline keeps you interested.