Let me first tell you that don't go with any expectations just because of the Kolaveri Di song.
Amazing performances by Shruti Hassan and Dhanush. The emotional scenes have been well enacted by Shurti Hassan esp in the climax when she cries her heart you.If you follow her journey carefully you will understand her pain.
Dhanush as a school kid is not so convincing but in the second half he plays his a game. what a performer. Take a bow. He is unpredictable makes you shift at the edge of seat.
Watch it for amazing storyline, screenplay and outstanding performances of lead cast. Its not a typical masala flick but a film on a topic that hasn't been touched on.