The Sacrament is a fairly straightforward movie. It's about a group of guys who are part of a documentary film group and one of the guys' sister moves into an isolated commune and the film crew wants to know the full scoop. You'll know exactly where this movie is going as it progresses, but that isn't necessarily a bad thing. It gives a chance for director Ti West to establish some character background and vague insights into the religious group while slowly turning the creep dial up until the movie's climax. The acting is good across the board, the standout being the Father (Gene Jones) who is suitably charismatic as the cult's ominous leader. For a found-footage movie it's shot well, but of course there are the typical issues that come with the turf - impossible angles, how the footage was even found - but these are things you'd know going in. The movie itself is a well executed, suspenseful slow burn.
The biggest fault in The Sacrament is its predictability. Again, it's not a bad thing, we just know what's coming at every turn. Creepy cult, innocent people poking their noses in places they don't belong, an underlying dark scheme that slowly unravels to the protagonists. If that kind of stuff interests you and you're willing to forgive the tropes that come with the genre, The Sacrament is a worthwhile watch.