I saw it yesterday, so here's my opinion on it.
The movie is very well made. Very atmospheric and creepy, with convincing performances from all four (!) of the actors. It was very entertaining and engaging, and held my attention the entire time.
However, while it was definitely very creepy, it was nowhere near as scary as it's been hyped up to be. I never got chills, I never jumped or cowered in my seat. I did get some heebie-jeebies when I went to bed last night, though.