I have watched the original Tamil 3-4 times so far and I like most of the one-lines , subtle and non-gross humor. Also the fantastic music.
But the Hindi version might have lost something in translation. I watched it but its not a bad movie. I agree that the supporting cast has done a better job than the new hero-heroine. And the ending makes all the twists and turns pointless. But I guess Gautam menon was not sure if the Hindi audience would accept the same Tamil ending. I hope that someone who has fallen in love with a girl and lost her would be able to relate to the story. For the same reason, I urge all to watch the director's cut version with the alternate ending.
But still the movie is not as bad like the critics have reviewed. The whole point of the movie is that this is a story about a 22 year old boy who is acting like a 19 year and a girl who is confused and prefer to suffer than go against her parents. Don't expect super melodrama or cheap comedy or item numbers. I have lost count of friends who have told its their story.
I give 7 stars because of the dialogs, music, camera, good performances by support cast.