8/10... however...
i'm a fan of found footage movies and i think this is one of the best (After Grave Encounters and maybe V/H/S)
I would love to ask the director if the kids were possessed or just evil, however he would probably say he was deliberately ambiguous
One thing i found hard to believe that has not been discussed is that it seems the parents did not look inside the kids little house of horror until the end, i also think that any parent would snatch the drawing pads out of the childrens hands to see what it is they wouldn't show