It started off as a romance drama (in a different way) then turned into a decent murder mystery, and then went full-blown whodunnit with twists and turns that was trying too hard after a point, and then turned into something totally different, and then I was like "Oooh! Inteesting. I see where this is going...OH! Wait, WHAT!? NO WAY! I did NOT see that coming! :O Long story short, I think this was a bold movie to come out of India, especially out of the Tamil Film industry. Props, where deserved!
I don't want to reveal much, but you need to watch this to make your own judgement. You're either gonna think there's a lot going on in the movie and dislike it, OR you're going be very pleasantly surprised with the message. You might have your own reservations on the HOW, but will welcome the WHAT that the movie is trying to convey.
Overall, I think the story did try too hard to throw you off (and...it worked...?) but I guess I'll give it a pass. Surely worth a watch!