As a massive horror movie fan, here are a few on netflix I thought were great.:
-The Grave Encounters series (especially the first)
-The VHS series (****ing awesome)
-Black Death was an awesome horror movie (Sean Bean is the main character, and it's set during the middle ages)
-Stake Land is one of my all time favorite vampire movies (though it seems more like a zombie movie).
-Let the Right One In (also one of my favorite vampire movies, and its actually a super original vampire move)
-The House of the Devil (takes a bit to get going, but its gets great)
I'm not sure if it's still on Netflix, but 'Exam' is ****ing awesome. It's a British psychological thriller and the entire movie takes place in a single room.