Now let me tell you... Quake 4 has a decent story. It's not the deepest story and it's certainly not the most original but it is enjoyable.
For those of you that don't know Quake 4 picks up right where Quake 2 and it's expansions left off. A lone marine has infiltrated the Strogg base and destroyed their leader, the Makron. Well... shortly after the Strogg build a new Makron and it's off to war again.
You control Corp. Kane. A marine hardened by combat against the Strogg on Earth during the initial attack. Kane is considered somewhat of a war hero because of something or another that happened in Dallas, Texas during the invasion where apparently he ran around and kicked alot of ass.
About two-thirds the way into the game Kane gets 'Stroggified' - since that's what the Strogg do. They turn people into them (much like the Borg in Star Trek). Which is why the game has the utmostly unoriginal tagline of 'The only way to defeat them - is the become one of them.'

Quake 4 is a good game... and NO it may not do anything new for the genre but that doesn't stop it from being highly enjoyable and having very high production value. The graphics are amazing. The level designers should be put on a pedastal for the work they did on this game. Every metallic corridor, every pulsating biological mass, every speck of dirt is pulled off with stunning detail. Especially if youre pc is powerful enough to play the game on it's highest settings.
But this here is why i'm posting this. Quake 4's ending blows. Really bad. It's another one of those things where you play through hours and hours worth of awesomeness only to be greeted with the most simplistic and incomplete turd of a cinema you've ever bore witness to.
The ending must be like 2 minutes long at the most and all it shows is this Aliens APC ripoff vehicle fly into a hangar where a bunch of your fellow soldiers are. Kane walks out - still a Strogg (who was earlier dealing with some pretty heavy racism) and all your little buddies start clapping and pat you on the back. Then your commander gets 'the phone call' and tells you that 'you have new orders'. Then you hear the Makron laughing and that's that.
Man... that blows.