GameCube: Resident Evil (remake). Man, this game has changed, and every change they did was awesome (though I don't like the zombies waking up again after killing them, but burning them to avoid that is awesome though). It's sadly not very scary (been scared like, 2 times), maybe I've been playing too much Fatal Frame/Project Zero.
PS2: Shadow Hearts: Covenant and Guilty Gear X2 #Reload. SH:C kicks ass, and I'm too bad at GGX2#R to fully enjoy it, but I still enjoy playing.
PC: Guild Wars (if you see Razhkrut Alazakard (PVE), Griffith Alazakard (PVE), Stormh Alazakard (PVP) or Abomin Alazakard (PVP), fuckin' shout) and Enemy Territory.