I found the acting to be good to real good, the plot was easy to grasp and gets your interest. I guess this means the direction was done well. The sound was excellent, (something I have come to appreciate in a movie). The interaction between the characters in the openingwere short but kind of believable for me.
Its got the expected gore and nudity, but my problem with this movie was the things that did not match up to the foundation. Under the circumstances the 'ceremony' would never have been made common knowledge. This one scene (ceremony) was the pivot for the movie, so its kind of a big deal, and just not believable due to how the head vamps are manifesting themselves.
And then the scenes that follow after the ceremony make that one scene nonsensical. So I guess they were too anxious to get the gore in at the cost of their well developed first 2/3 of the movie.
Something happens to the 'elder' and this severely affects some but conveniently not others, and how did the found footage make it to the media. large numbers of unnoticed missing people in small area. etc
They really needed a beta testing group, this could of been so much better than it turned out to be, they just did not take the time to make it right.
I really liked a lot of the movie, but the action scenes just kind of sent it to ludicrousness of the realm of unbelievability when a viewer even thinks about it for a littel bit.