Enjoyable, but do not expect much
The premise was promising, but execution wasn't that good. What would teenagers do with superpowers they suddenly acquired? According to the director of this film, nothing really -- they were mostly obnoxious to the others, constantly doing pranks, giggling and talking nonsense, but I guess, that would be pretty accurate description of today's average teenagers. If you remove the supernatural part of the movie plot, you actually get standard teen drama, covering issues like bullying, domestic abuse and poverty reflecting on an ability to solve your own family health and other problems. That sounds like cliche, well, it is, but might even worked here had they really applied the supernatural elements of the story in a good way. But we haven't seen that - the characters treated their newly acquired abilities just like any other talents they might have had. For an example, in one scene we have seen both bad and good sides of their superpowers - they could kill but also save people. We haven't seen that they have really learnt something useful from that. They just continued to behave like typical teenagers. Main characters were interesting, but didn't evolve - if we do not count Andrew's dumb and odd decision making and transformation at the end of the movie. He was soooo annoying from the beginning, constantly whining about being alone and not having friends while Matt and Steve (really likable boys) constantly tried to prove opposite, in vain. Andrew was simply an idiot, beyond anyone's reach. Your coming from an abusive and unhappy home doesn't give you the right to be obnoxious and evil. Hmpf...
In short, standard teen drama with supernatural elements. Ignore ridiculous found footage aspect, and you might enjoy the movie, but do not expect much of the story.