Let me preface this by saying that I was pleasantly surprised by this film. I went in expecting a thriller, not a horror, and it actually quenched my expectations fully and with a little bit of horror tossed in on the side it made for a pleasant viewing. And from the reviews on this site I honestly wasn't expecting too much. But I've experienced this kind of incongruity on IMDb time and time again. Great film, terrible reviews.
I'll start with it's strongest point which is the story. The story is absolutely fantastic and was presented almost flawlessly. You can feel the misdirection, as thick as arctic sea smoke, which is the key signature to a thriller's atmosphere. It'll start asking you questions that you didn't even know you wanted to ask. There was not a single moment when I felt I knew exactly what was going to happen next and yet everything was still easy to follow which, IMHO, is where most films (in this genre especially) go wrong. Even to the very end you're still asking questions but if you payed even a modicum of attention you'll understand everything just fine.
The acting was decent. Some parts were a little weaker than others mostly due to underacting in a few scenes that involve gore/action, which detracted from the experience but considering that we're not talking about million dollar A list actors the performances passed my own personal 'litmus test' and I consider it quite nominal. One scene in particular will linger in my mind as the most outrageous and yet most underacted scene in film history due mostly to the writing rather than acting oddly enough. Came across a boorish sight gag to me.
Cinematography and editing was well done. The special effects and CG left something to be desired but I'm sure it was a matter left to budget rather than talent or design/concept.
Don't follow the 'advice' of the other reviewers. This film is much more than the poor (and poorly written) reviews it's received thus far. Watch it and expect an independent film that will delivers a clever story not as a premium blockbuster the AAA studios churn out.