A solid attempt at making a horror film about an urban legend called Slender Man (first time I heard about it, but it sounds kind of intriguing). I was pleasantly surprised when I saw the special effects used for depicting the Slender Man. Yes, he appears very briefly on screen, but looks well made (this is an extremely low-budget movie, so I wasn't expecting him to appear at all). The rest of the movie was just your standard "found footage" horror, unremarkable and mostly dull, only slightly more interesting toward the end.
Can't say I would recommend this to anyone but hardcore fans of "found footage" horror movies like The Blair Witch Project. It's mostly boring and acting is unconvincing, but considering it's very low production standards, it could have been worse.