Was the most cleverly done horror type game I remember playing. Actual scary games? Hrm, well F.E.A.R wastes my ammo a lot with seeing shadows move and people looking in on you. Can't do that to someone who plays a lot of shooter games, I always take that shot and I was always aware that what I was shooting at wasn't there.
Side note: Doom 3 was fucking annoying. I hate loud sudden noises and I hate things popping out at me. Glad they didn't that as much in Quake 4.