Flawed movie carried by Vera Farmiga and Patrick Wilson
The movie has many issues: the first is its predictability; if you're familiar with horror movies in general, then you can likely predict what happens next. The movie isn't scary. The relationship between Debbie and Arne needed more time, especially since they attempt to lean on their relationship all of a sudden at the end. And lastly - the movie tries to make Arne seem sympathetic in the postscript, as if the real Arne Johnson was really possessed and therefore innocent (in truth, he was a criminal convicted of manslaughter)
But nonetheless - the movie is a fun B-level film. By far, the biggest asset is the performance of the two leads, Vera Farmiga and Patrick Wilson. They were charming, likable, charismatic. I truly believe that they carry this otherwise flawed film.
B+