I am guessing that a lot of the low ratings have more to do with the fact that this movie does not immediately start splattering the audience with buckets of blood and splitting your ears with crescendoing screams.
This movie is NOT following the normal Hollywood script. There's no "Oh yeah-there's the Monster" There's no parade of "Oh Yeah, the A-hole is gonna get it"
This is Horror from the Suspense side of the formula. It's a story of a Guy who does something wrong in the pursuit of his art. And something is unleashed in return. Consequences and collisions occur in the context of a different continent and its own cultures and messy histories.
No, it's not a DEEP movie, but it's an interesting departure from the usual fare. Nor is it a non-stop splatterfest.
Watch this when you're in the right mood-- somewhere in the middle where you just want a good movie to fill the time and give you a story from a different place besides Hollywood.