I actually paid to see this at the cinema and I thought the film was so bad and misleading due to the trailer that I was wanting my time and money back. At the end everyone in the cinema stood up and were muttering "Is that it?" I'm not saying it has to be like The Exorcist or anything but if I weren't in the cinema and it was on TV I'd end up walking away without pausing. That's when I know the film is bad. If you like Paranormal Avtivity which I found to be quite annoying and predictable then you will probably like this but it's not for me. I wouldn't call it a horror, it made me laugh more than anything, and I personally find it poor for a paranormal type film. The Exorcism of Emily Rose was far better, it told the story of possession without focusing on possession if that makes sense so it wasn't out to scare.
But overall I'd give this one a miss, nothing that caught my attention and I do watch a lot of horrors and so I won't say it's the worst horror made but a lot of these modern possession films are just rubbish. It takes everything you expect from ghosts, demons, possession etc and throws it into a movie. I have never seen a film where they do a different take on it. It's always doors slamming, speaking backwards, demonic voices... It's been done too many times someone has to do something new that goes against the expected.