AvP is great. The sound is excellent, really adding tension to the game. Any game that makes you jump (think also of Unreal, Half Life, System Shock 2, ... ) must be good.

Other highlights of Alien vs. Predator are:

  • Cloaking as the Predator. This allows sneaking up on hapless humans before you kill them in one of many exciting and inventive ways.
  • Playing as the Alien (well, Xenomorph actually) is cool. You can scamper up walls and ceilings, as well as suprising people by eating their heads. Also, you gain energy by, umm, eating people. Excellent.
  • The marine has a proximity detector. You know things are coming towards you before you can see them. Tense.
  • The predator's spear-gun is also fun. If you shoot someone's head, it will often fly off their body and be pinned to the wall by the spear.
What more could you want from a game? It is a shame the multiplayer game is not better, but who cares; the singleplayer game offers so much entertainment.