Outlast was great, though it was a journey that ended without making any real sense, for the whole journey you only have a camera, and the light it portrays is dark green, very atmospheric, especially outside in the dark, there were a few jump scares that got me, most of the game was stuff I could just run past now (because 75% of it, you were expecting something but nothing happened)
Because of previous experience with stuff like Amnesia it was similar.
Also has anyone played the "P.T - Playable Teaser" for the new Silent hill by Hideo Kojima?
Its pretty complicated, but very scary, definately the most immersive horror I've played in a while, its got both atmosphere and jump scares (which are awesome when they get you) - you might need a guide to get through it like I did, that is, if you can stomach its creepiness.