Doom 3: Resurrection of Evil (Xbox, 2005)

If you liked Doom 3 (or any of the Doom games for that matter), you'll probably enjoy this. The game gives the classic "creepy" feeling, leaving the player with the paranoid, heart-in-throat feeling that something's juuust around that corner. Though the game could've been longer, this already was an expansion on an already pretty decent length game, not a sequel. It's a good excuse to take a chainsaw to a zombie marine or double-barrel shotgun to a demon.