Just so you know, there are minor spoilers here.
Unlike some of the claims here, it's not actually a "found footage" movie. It's filmed in that style though, portraying events which are purported to be real, from a 1st person perspective. however if you watch closely the last 10 minutes or so you'll realize it can't be found footage. I'm trying to avoid spoilers here, unless it's absolutely necessary.
there's some good ideas here, some of which i'm sure we've all had while watching yet another horror movie made in the wake of "the Blair witch project", you know the sort, when you think "if they had shown that (censored) there, the tension would really, really go through the roof". well, they finally did, you'll realize what I mean when you see the bit about the trees.
That's the good part, the bad part is that it's yet another of those movies that can only scare that class of viewers that cover their eyes at the first sight of anyone that's simply running in the dark screaming. i've already watched this movie 12 times in the last month, all of them with different titles, all of them with the same plot:
"remove protagonists from the perceived safety of urban life, and throw them into an isolated, unknown location. have them hear and even glimpse a threat, but never clearly enough for them to understand exactly what it is that's after them. never show the threat clearly enough that the viewer can identify it either. reveal that the threat is strong and fast enough that it can run them down and tear them apart if it should choose to do so, then reveal that they're obviously facing the son of a scooby-doo cartoon monster: whenever they're out in the open and vulnerable, the monster stands there and watches them, listens to them ... does things to the trees around them ... but otherwise leaves them alone. when they see proof that the monster is lethal, get them to run like headless chickens from a to b to c, in the dead of night (hardly ever a good idea) yet the scoober never quite manages to catch them, only showing a desire to do so if and when they reach shelter."
unfortunately they've made so many of these movies that it's become virtually impossible to come out with an innovative conclusion to these events, or even an innovative plot twist. they've been repetitive up to the very end, they might as well have a rational, if repetitive, denouement, but somehow that doesn't satisfy the filmmakers. fortunately for them, the found footage genre gives them an easy out, and this is "close to found footage" enough that it can be bent into the same kind of ending: EXPLAIN NOTHING. NO. THING. to be fair, in this particular movie, at the very end an unseen man's voice actually puts a name onto some of the things you see, SOME, and it's more of a hint to get your brain working in the intended direction. if they had shown some restraint about what to put on screen at that point, it would even have worked, but they chose to put a large number of people behaving inexplicably at the end (the message apparently being that they're either mental patients, or at least they've gone mad) and that doesn't work well with the (SORTA) explanation provided by the unseen man...
it's just another mess of a movie. there are a few decent special effects at the end (up to that point there had been only three moments with special effects) but they're off the screen before your brain catches up with what you've seen, and personally I wish they'd invest more money into coming up with a coherent and believable script throughout, rather than for special effects in the last 10 minutes of the movie.
like all the rest, it's a lightweight horror movie that only easily scared people will appreciate, you know the kind: they will invariably tell you that they've "watched it from behind the sofa".