Take Away actor Dhanush and Yuvan Shankar Raja, you are left with nothing in this film. I agree that this is rather poor for an attempted 'COMEBACKS', director Selvaraghavan is only person to blame in this project. There are couple of problems with this movie, main thing is that it fails to convince on psychological metamorphoses that turn twins into enemies nor makes up its mind what it's trying to convey as most of the interesting things in the film are in the first half. Whilst I knew from the beginning that it was going to be a predictable fare and it did. Right from the opening i knew where this Selvaraghavan was taking the film, i just hang in there because to see more of villain Dhanush. It gets draggy and crumpled in the second half, not what I came for, but does right by it for the current (actor>director) Selva's standard and the ending feels like a rushed cap off to a film such as this. But the film boils down to a simple parable about good and evil, actions of the past and generic revenge angle.
I am not gonna say this is horrid, the paranormal and psychological angle is riveting which is explored well in the first half. The second half with the supernatural revenge thriller inspires little interest. Even the father-daughter relationship parts were pretty good and doesn't come across as a yawn.
To sum it up, it's atmospheric with all the authority of the lead, supporting child artists, it looks like a creative experiment. Kudos to Dhanush for trying out new narratives but the plot had lot of interesting possibilities doesn't mean it is bad movie, it will hold your attention. For Dhanush, every work with Selva is an undoubted success commercially and critically. In this film, he has done two polar opposite with brilliance accentuated by background score of Yuvan and there is nothing more to add here.