Pretty disappointing. Really, it seemed to be almost content-free, after the initial discussion of the Prisoner's Dilemma and the contests organized around the same.
Like many "popular science" books, this one paired a researcher and a writer, so the researcher's ideas could be palatable to normal people. Unlike [b:other such books|1202|Freakonomics A Rogue Economist Explores the Hidden Side of Everything|Steven D. Levitt|http://photo.goodreads.com/books/1157833345s/1202.jpg|5397], this pairing was a failure. It seemed like the book was constructed in a way to not include too much math for normal people, but not include too much soft content for the scientists. The result was a book that didn't offend, but didn't have anything to offer anyone. And way too many stories about how Nowak met this person who (in addition to being a brilliant researcher) liked to play guitar or squash or whatever...