The first half hour, which is 100% travel-documentary and sickness drama, is so compelling and believable I often wondered if it was the wrong movie. After the horror stuff begins, it gets repetitive (try drinking every time Cliff asks Derek "Are you OK?") and a bit muddled, though never boring or predictable. Too bad the "mythology" here is so thin. Recommended for horror genre and found-footage aficionados.
The first half of the film proves to be engaging as we become attached to the Lee and Prowse characters through their chemistry with one another. While the change of perspective in the second half, as well as the uniqueness of its action-horror scenes with its inventive photography, can be applauded, it also has a downside: it loses the emotion when the horror, action, and drama feels akin to a video game.
On a technical level this was nothing short of amazing. The camera work, effects and trickery was simply mindboggling considering the budget.and the talent involved. On that note this movie was an absolute success. When it comes to scriptwriting and directing things aren't that successful. After a great start with a convincing first act things meander into standard Hollywood plotting losing its own voice.