One of the greatest story lines ever; time travel and the implications/possibilities of changing the future by going back.
Furthermore, as timely as ever as we, like the fools we are, leap into drones as weapons. The supposition of the movie is right here with us today; computing power reaching the point of self awareness and the rather simple logic of recognizing man as the real threat. SPAM, viruses, hacking, inter-connectivity. They could have done a better story line and tied it into the Iraq war, A'stan, Snowden, his REAL secrets, the Patriot Act, NSA, TSA, and shown a president asserting the power of judge, jury and executioner, implied Obama is a terminator.
Oh, could I write a good movie!