I have not seen the Tamil version but the romance was the same old contrived stuff from Tamil films, and it took up too much of the screen time. Its one thing to establish the relationship so we care about the rest of the film, but it took too long and wasn't very good. The opening that established Sanjay's apartment and his daily ritual was good, but the action scenes needed some more suspense and a few more twists. This is just the usual Tamil masala film, but in Hindi.
ARR's BGM was good in the action scenes, but he reused the Guzarish humming way too much for some of the romantic scenes.