There is a part where he talks about it being important to get into the skin of who you're fighting against to work out why they're fighting. Regarding Vietnam: "In the case of Vietnam, we didn't know them well enough to empathize. And there was total misunderstanding as a result. They believed that we had simply replaced the French as a colonial power, and we were seeking to subject South and North Vietnam to our colonial interests, which was absolutely absurd. And we, we saw Vietnam as an element of the Cold War. Not what they saw it as: a civil war." It was a fascinating segment because he was illustrating that the US had effectively misunderstood the motives of those they were fighting against and had misunderstood how they viewed the US actions. Actions like this are repeated over and over again. McNamara was a technocrat: give him enough data and he could crunch the numbers and tell you how to do things: how to bomb German industry, how to make thousands of Chevrolets efficiently. What he could not tell you was how to break the will of a peasant people seeking independence and to emerge from colonial subjugation to take their place in the world. Because that's not something amenable to data, spreadsheets, and cost-benefit analyses. McNamara's grand failure, and one of which he remained oblivious, was his inability to see the limitations of his over-technical, rationalist approach. He was an ideal man to run a car factory. He was a disaster as a leader in war.

Some good points, but not as good as expected.

The complete title of the film is Fog of War - Eleven Lessons from the Life of Robert S McNamara.