Dead Space was pretty scary, I mean it resorts to cheap jump scares for the horror but it does work perfect. The atmosphere is pretty intense, the sound design is top notch and the gameplay itself is very involving, besides Fatal Frame, I've never played any game that scared me to the point that I went AWOL on that game for a year. The sequels we're kind of toned down a bit, I'm playing Dead Space 3 now, and I have to say, that game is pretty intense.