It would have happened like the director assumed that the audience will also assume and understand the movie flawlessly.
Katrina Kaif was worst and music was likekaam chalau types.
And there were too many songs irritating some time as Ranbir speaks in songs language everytime but looking somewhat good and the story of arms which still transport by two head to end the humanity stopped by Jagga(Ranbir) while jasoosing his father is dead or alive.
Inshort you wont miss any great thing if you dont watch the movie.
Instead invest your time and money for other movies like MOM and GUEST IN LONDON which leave a great message for the prevailing humanity.