It just sort of dulls the effect for me, having monsters coming at me all the time.
There's another thing I think a lot of horror games are missing. It might not have worked that well in Dead Space, and don't get me wrong, I'm liking this game. But I wish more games would put you in situations where you're essentially helpless and your only option is to F**KING RUN!!! ( which is incidentally a game mode in FEAR 3, an otherwise ... not very scary game ). I mean, when you hear something in the vents, and you start looking around, wondering where it's going to pop out, and it just keeps lurking, and you start running, and you know something's after you but you don't look back, that's when it gets really scary. That's panic, man! Games need panic. They rely too much on jump scares these days, which is pretty much the lowest form of horror.
But, like I said, there's a lot in this game I like. There are moments where I feel like just running. And the sounds are awesome. I love how everything is designed to scare you. Like, even the sound when you get a transmission from one of the other guys is this nightmarish screech. And the voices. Man, I hope they explain that one too. Limbs and disembodied voices, those need to be explained.