Rumsfeld was a controversial figure. Reading his book, I was struck with several of his rules, insights and stories regarding everything from how to run a meeting, thinking strategically, confronting crisis and criticism. Some of his rules are genuinly good ways to remember certain advice. I particularly like "Dogs don't bark at parked cars", "Luck is what happens when preparation meets opportunity", the infamous "unknown unknowns" line, "the world is run by people who show up", and "When starting at the bottom, be willing to learn from those at the top". These rules (and several others) will stay with me after reading this book.
While the book is insightful, there are also several issues in my view. The main two issues I have is that, at times, the book feels a bit superficial and glib. Especially the chapter on "the case for capitalism", despite the fact that I agree with the premise, felt cliché. It's odd to me that Rumsfeld can, on one hand, so perfectly describe the importance of working together as cohesive unit to work towards a larger common goal, both in buinsess and in the military, but then on the other claim that we are all fundamentally only self-interested in the chapter on capitalism. These are, of course, not mutually exclusive but to not acknowledge and address these kinds of inconsistencies makes the book feel more superficial than it ultimately had to be.
Ultimately, the book was still enjoyable, accessible and worth it to read.