I think the scariest part to me was when you first enter the hospital. A little cutscene (kind of?) occurs that shows a couple zombies walking around slowly, then out of nowhere, a hunter jumps from behind the corner and slashes the zombies head clean off. lol
I don't think the parts where Nemesis pops out and runs after you were really scary. I'd say...more of just a little adrenaline rush.
Here's the video (at around 3:00). But I could swear I remember the hunter slicing the zombie's head off. In this video, that doesn't happen. The head stays intact. Am I remembering wrong or were there two different versions of some sort?