YES YES YES. One of the best single player (and multiplayer) games I've ever played. It makes you go and watch every single Alien and Predator movie over again (I did). I didn't find the game to be as scary as everyone says, probably because I'm a console gamer and I've played through the antics of Silent Hill, Resident Evil, and other ultra-scary games. But it will catch you off guard a couple of times, either way. Plus: You get to play as a Marine, an Alien, or a Predator. VERY cool. You basically have unlimited health with the Predator, it's badass.
For $20 I'd definitely buy it. Plus, the game engine is a VERY nice one, it will run EXCELLENT on a computer that isn't the best in the market.
Marine is excellent as well; you get the STAR Rifle and the Pulse Assault Rifle and all the goodies that are in the Alien movies. You just feel like such a fucknig badass when you are blasting away at hordes of Aliens.
Also, four words: Playable Power Loader Missions
