Dead Space is my horror game. The atmosphere is so visceral (harr) and suffocating that you are never allowed to feel comfortable. If the game let's up, you will be punished for taking a breath as soon as you step into the next room. Not by relentless action, but the atmosphere. God, I swear the sound design in this game series is by far my favorite of all time. The first game made whispers of the effects relentless terror can have on the mind, both the protagonist and player, but DS2 fucking hammers you with hallucinations, helpless paranoia and guilt ridden psychosis... And lots of screaming violins. I LOVE DEAD SPACE. For me, its everything RE was for me as a kid, but with a critical focus on doom.
... And then there is the art direction. Don't even get me started.