Still unsure what to think

Rating: 10/10 (20 February 2013)

It's been about two days since I watched this movie on pay per view and I have had a difficult time deciding what I think about it. There were things that I thought were great and others I felt were just plain stupid and I have been trying to put them all together in a way that makes sense.
The best part of the movie were the snuff films. This isn't me advocating snuff films in any way, as I find the concept one of the most disgusting things a human being can do. Fortunately, they were in no way realistic and the slight catches of the supposed serial killer were the interesting parts.
My biggest problem with the movie while I was watching it seemed like not much was happening. The movie follows a pattern of watch films, argue with family, talk to Deputy so and so. At times it was difficult to keep my attention on the film.
When the movie ended, in what I assumed was a dreadful ending, I was already to come onto IMDb and assign one star to the film and give it a bad review. However something kept me from doing that.
I'm 37 and have been watching horror movies since I was five. I had cousins who were babysitters who didn't mind watching them in front of me. By the time I was a teenager, I was more desensitized. This is not to say that no movies have scared me, but they are extremely rare. And there was nothing in Sinister that I can recall being remotely scary.
However, as I got up to go to the bathroom, an unexplained feeling of apprehension came over me. I actually ended up turning on the hallway light, which is rare because I tend to spend a lot of my time in the dark. I found myself looking back and forth. While I was in the bathroom, I heard a sound (probably one of the four cats) that further bugged me.
The thing I can't explain is that I can think of nothing in this movie that was scary. Absolutely nothing. However I was mildly frightened moving around in my house in the dark after watching it. So even if I can't pinpoint what it was, I had to come to the conclusion that there was something in this movie that scared me. And I like being scared. So even though I was sure I did not like this movie, I have to give it a good review because on some level, it did what no horror movie in years has been able to do: scare me in some way.