SH > DS > RE interms of scary factor. I still remeber SH1 its so scary that i dont play it in night time and having nightmares after that.

I never encounter that in RE or DS. They are more like action shoot them up with some horror element. It still give some shock but thats it while SH is like ZOMG the eerie sound the dark surrounding with only torch light ... man its scary as hell thinking bout it