I found YellowBrickRoad to be deeply unsettling, like a nightmare that tugged at something deep inside me. This is definitely a slow, mostly subtle horror film, and not for everyone, but I found it better than most that I've seen. This was a surreal, disturbing experience that took a group of ordinary people in a pretty ordinary setting and situation, and gradually morphed it into an anxious world without reliable reference frame in which we're not sure what is real. If I like a movie, and I did like this one, I tend to strongly empathize with the characters and their situation, and I found myself feeling the anxiety of questioning reality and my own grasp of it. Shortly after watching the film I went to sleep and proceeded to have what seemed like hours of dream obviously derived from the movie.
Comparable films are "The Blair Witch Project" (the original one--for obvious reasons when you see this one) and "Session 9" for the slow, character-driven build and growing sense of dread.
Yes, there was one plot detail which strained credibility, was a little distracting, and I think could've been easily avoided, but I was willing to overlook that given that otherwise the overall experience worked for me. Regarding the ending, I know many posting here found it unsatisfying. I feel strongly about endings and usually like them to be clear and unambiguous, and I liked the ending of this film. Having said that, I understand why some would not like the ending, but it made sense to me and sealed the horror of the story.
