I'll give credit to Brolin and Kidder, they are fantastic and certainly sell the slow break down of their sanity. But the movie seemed to me to lack a cohesive narrative, and a lot of plot threads that lead nowhere, the priest and the cop. I also felt that the climax was...unbalanced, with any of the high tension for me gone by the time he runs back into the house to save the dog.
Wall bleeding was a good effect though.