Slenderman is a slow, atmospheric creepy story. The acting is good, the cinematography is excellent. At the very beginning of the movie, it explains that almost nothing is known about the history of Slenderman so, of course there are no answers to the question, "Why?" He gets in your head like a virus and then, you might go crazy, you might disappear, you might die. I enjoyed the movie on this dark, rainy Sunday. I believe the critics dismal ratings are way off base.