I purchased this book because I found Walter Isaacson's biography of Steve Jobs so excellent.
This biography of Kissinger is good until it reaches the election of Nixon and Kissinger's work in the Nixon administration. At that point Walter Isaacson goes postal and the book turns into a kangaroo court of Nixon and his administration and the topic of the book, Kissinger, becomes just an afterthought. I stopped reading at around the time of the invasion of Cambodia ... the book just became too irrational and devoid of objectivity.
I will try the other Walter Isaacson book I bought (Einstein). Hopefully the distance from, and lack of personal interactions with, the subject will make for a more balanced biography