Put about 8 hours into this now, and nothing really that scary so far. There's no jump scares to speak of, it's mainly some areas being a bit unsettling, but the scares happen organically, eg if you go around a corner and there's one of the creature-type enemies on patrol there.
There was quite a funny moment when that happened to me. I was creeping around a building, aware that somewhere I could hear one of the creatures stomping around. I went to the top floor, came out of the stairwell, and it was right there in my face. Now, you can't hip shoot in this game, you can only fire by looking down iron sights or through a scope by holding down RMB. The gun I was holding at the time was my sniper-scoped pistol, ie when I held it up to shoot I couldn't hit a bloody thing with it. By now the creature is pummelling me quite severely, and in my panic I forget which things I've bound to which keys, and instead of bringing out my close-range shotgun to finish him off, I instead pulled on my gas mask, complete with unskippable 3-second animation.
At which point I died
It's a good game, enjoying it. I also appreciate that the maps, while not small, are nicely self-contained, so I can log in, spend an hour doing a mission from start to finish, then go back to base and log off. I find myself gaming in short bursts currently, so this suits me down to the ground.