I finally finished quake 4 today at Lieutenant level. I never played the default difficulty setting; I played the difficulty setting that was one setting higher straight away, because I've played a lot of shooters and wanted a bit of challenge. In the end, I came off very impressed. The single player campaign is just nonstop FPS action. ID Software/Raven really delivers an impressive shooter experience for the Xbox 360. I also like how the game ends...the final battle is pretty epic and when you finish it, you get this nice feeling of satisfaction and reward. While the ending is the usual 'short ending' that most games have, IMO I thought the ending was pretty satisfying. It finishes the story while at the same time leaving everything a bit open-ended: SPOILER WARNING! At the end of the game you get all the nice congratulations from all the other soldiers; however, there is a slight hint that, since you yourself are a Strogg, essentially, the Strogg have not yet been defeat...