Pretty great movie, Story is quite funny, seeing Vijay Sethupathi being a fake rowdy is pretty hilarious, with him setting up scenes and all that while actually making pretty good cash. Nayanthara is the absolute star of the show however, her acting is brilliant and she looks absolutely gorgeous. Her character Kadhambari is hearing impaired and Nayanthara really brings her to life and allows the viewer to connect with her character.
The story is nothing to write home about but it's funny at parts and good enough, so that Vijay's great acting and Nayanthara's beautiful looks and superb performance can shoulder the shortcomings.
My criticism of the movie comes with how Vijay's character, Pandi almost comes across as if his emotionally manipulating Kadhambari in some scenes. That or his abusing the fact she can't hear to hide and conceal things from her, namely her fathers death. While on the subject why doesn't Kadhambari get a hearing aid? She obviously hasn't completely lost her hearing and with a hearing aid she may even be able to hear again.
Anyway perceived manipulations and jokes aside, Naanum Rowdy Dhaan is a solid entertainer, with a lovely cast and superb performances as well as a decent storyline and great directing from Dhanush. A solid, well deserved 7/10 from me.