Isaacson's biography of Kissinger is a classic, yet it has its pros and cons. On the positive side, Isaacson is extremely thorough in his research. Given that this was one of his early works, he might have put in extra effort, and it shows. He also excels at getting into the psyche of Kissinger, understanding his motivations, failings, and psyche throughout the various episodes discussed. This helps in trying to understand Kissinger but can also lead to partiality. Moreover, the book red-pilled the author on Kissinger, highlighting his lesser-known wins and exonerating him on some of his more famous "failures".
However, there are also some negatives. The book is mostly focused on Kissinger's time in government, to the point of parody. With 800 pages, 600 of them cover a short period of a few years, while his early life, including his childhood in Germany and time at Harvard, is rushed. Additionally, the detailed descriptions of the Nixon presidency can sometimes be irrelevant and not really contribute to understanding Kissinger. In some cases, like the conflict in Angola, Isaacson doesn't commit fully to discussing the details, leaving the reader with a half-baked understanding.