While the movie has a few glaringly laughable scenes of characters reacting stupidly (particularly the main actress), it gets off to a great start right away and a consistent feeling of dread, catalyzed by curiosity, which keeps you immersed. Justin Long is excellent in a serious role despite my preference of him being funny, though there is some of that, too. In fact the bits of satire here and there must be appreciated. Certain realisms such as how Justin's character reacts to a horrifying scene in the beginning was depicted really well and laudable especially in the face of other situations portrayed terribly. Effects were pretty good, albeit a bit cringe at times, but the low budget and gritty feel to the flick definitely added an unease to its horror vibe. Moreover, the creativity; this isn't a slasher flick, but a hybrid sort of creature feature. The ending, I really gotta give props for - unexpected, and it made me like it even more. I'd have given it a 7 before the ending.