To be honest, I was a little disappointed by this book. First, the author writes well and does a nice job of telling the reader how important Warren was to the people of Boston and to the colonies at large during the lead up to Bunker Hill and the start of the Revolution. My problem is that I felt like the author tried too hard to show us Warren's importance. There were quite a few passages that basically made the argument that because of X, it shows that Warren must have been thought of as amazing.
There is very little writing from Warren to add to a narrative history, so I felt like the author used the term "likely" to describe most of Warren's life. One example would be the early chapter on Warren's time at Harvard. Other the the facts of Warren's attendance and record from the school, there are not any quotes from Warren about his time there. All of the information was from secondary sources about the school at the time and that is how the author presents the story. That is not a fault of the author, just the reality of the source material and it took away from the read for me.
I will give the author credit for bringing an important figure to our attention because Warren did play a major role that often gets overlooked (likely because of the lack of letters and personal writings). I just felt that most of this book revolved around the events Warren was a part of, and those stories brought nothing new to someone who reads a lot about this time period.