Near as I can tell the purpose of Freeman Dyson's Disturbing the Universe is to educate powerful scientists and heads of state on ways in which to conduct scientific inquiry without causing apocalyptic mayhem and destruction.
As I am not a politician, nor am I a scientist at the head of my field, it may be that I am not the target audience for this book. I found it to be a bit rambling, but that's to be expected from Freeman Dyson: a man who has expertise in such diverse fields as engineering, nuclear power, theoretical physics, politics, mathematics, astrophysics, and other head-thinkery.
The strongest part of the book, I'd say were the personal stories about Oppenheimer and Feynmann and the other Manhattan Project scientists that Dyson worked with at Princeton. There's a story about a road trip from Princeton to Ann Arbor to Albuquerque that really sticks out in my mind, and may be worth slogging through the rest of the book just to take that nugget.
Yes, I am a reading fiend. At this rate I should have all of the books on my "to read" shelf done by summer, and then some.