When I look back on it, the entire part of the movie where the dad goes into the 'further' is like a cheap haunted house. I didn't really care though, the rest of the movie was a VERY good scare. A lot of stuff jumped out at you, that was the main means of scaring, thought not the only. At one point, the mother sees a ghost dancing to some music she had playing. It was incredibly freaky.
I've seen a lot of scary movies, and I think this was one of the freakiest. Not for anyone that can't handle a scare, or children. The entire theater was screaming during most parts, and there weren't many light moments. It was ghosts all around, even in the day time (whereas most movies lighten up when it isn't dark).