Creepy
I have a MacBook Pro with Intel HD 3000 graphics and it only froze on me once, and that was after I adjusted the graphics quality. I think its more frustrating than spooky, namely because you cant see a thing in some areas, and since both tinderboxes and lantern oil are scarce it gets really difficult to solve puzzles in the darkness without losing your mind. It does have a scariness factor, namely because there are things that happen when your back is turned, and there are monsters that you cannot fight at all, all you can do is hide and hope they cannot see you.
ejhaskel about Amnesia: The Dark Descent