I think it was super scary if you ask me I mean even the idea that you must keep absolutely quiet all the time or some monster is going to come and that is the end of you is nerve-racking.
I hated it, I thought the people did stupid things the movie to me did not make much sense but what do I know it is rated high on IMDB for what that is worth.
The almost total lack of dialogue is a bit weird but the movie is awesome the acting is so good, scary movie so give it another try those who stopped watching.