My wife took me to see it when it opened. I had my head down working long hours all summer, so I was expecting a sci-fi picture based on the 2016 title.
In actuality I found it to be pretty innocuous. The author/narrator travels to places the president lived while growing up and interviews people to understand the influences surrounding the future president. From that he develops a theory on what makes the president tick. To me it's basically a big op-ed piece, and mostly speculation. The premise is too simplistic to be taken seriously. That said, it is a fairly interesting history lesson about where and how the 44th president grew up. I suppose you could get all that same information by reading the president's book too.