There are so many things that have to be taken into account for this movie.
Firstly, it's the only real 'christian' movie I'e ever seen. Meaning, that it was made for christians. Though it makes empty promises of psych thriller, horror, and plot twists, it's all so weak that Milton Bradley would be proud of it's ability to not make infants cry.
Secondly, even if you make sunday schoolers watch it, you'll get 60 minutes of snoozing at best.
I didn't look into the movie beforehand, but by the end, I was left wondering how such a thing would ever come into being. And who the hell would actually like it?
The answer: Millions.
If you look at professional critics, they are blunt and open about it's pansy ass attempt at Christian horror. But, the user comment reviews on IMDB show an entirely different side.
The christian community loved this damn flick. So, I suppose that I can't really give a proper review, because I'm not christian.
My only real advice is this: If you like weak, watered-down horror and the constant reminder that your god is watching, watch it. Otherwise, hit yourself with a hammer and sleep through the whole thing.