YellowBrickRoad (2010)

The premise for this movie is actually pretty original, something that never fails to shock me in modern horror. It does, however, have a significant flaw: the ending. Which I could get over if the whole movie didn't make me so "OMG what's going to happen at the end???" It's like they had all kinds of great ideas for the setup and then were almost finished with the movie and realized they had to have some kind of ending so they just shot something they thought of at the last minute. In fact, I would strongly recommend this movie to writers, as it's an excellent example of how sometimes no ending is preferable to a poor ending.

Also, the weird attempt at a New Hampshire accent is kind of distracting if you're from New England and hate that sort of thing.