I am a fan of found footage films because if they are done right, they can be very scary. "Atrocious" definitely has some tense, scary moments but basically you're always waiting for something that never happens. Tension is one thing, but you need a payoff at some point.
My main problem with this film is that it falls victim to the same problem that many other found footage films have. Which is, why in the world would you be holding on to a camera at that particular moment? You're running, likely for your life, and you're actually thinking about capturing the moment? I am willing to let a lot of things go when I watch a movie, but this just bothers me every time.
Secondly, it seems that the writers and director were unsure as to what to do with the plot. Is this the story of a terrifying urban legend, or is it something else? Overall, I think it's worth a look, mainly because you're only investing a little over an hour of your time, but don't expect anything amazing.