I saw it and I can tell you that I have not been scared by a movie in a long time. I recommend it, highly.
It's the sounds, the setting, the camera work, the freaky little kid and his mom. It was a remake of a Japanese film called "Ju-On" and the original director was the director in this one too. I guess it might be scary because it was different from the normal American scary movies. Like it was fresher? But then again, people might not like it because it might not be what they're used to.