The scare-factor of Amnesia is Paranoia/Tension.
The scariest thing will be you panicking because you don't know if something is going to come out of that door-ect.
It depends what kind of scares get to you. If you're the type who likes cheap scares when something just pops out of you, (like me), amnesia won't do it for you.
If you're the type who like the atmosphere, tension, ect, of horror games, Amensia, Silent Hill, and Penumbra are the games for you.