Some readers seem to feel that Surowiecki stretches this idea further than it really deserves thus leading to some repetition or padding. It didn't feel that way to me. Using genuinely interesting examples the author makes a case for how and why the wisdom of crowds works before going on to clarify the conditions that differentiate this approach from a simple matter of asking a bunch of people what they think and averaging the results. In addition to being just long enough it's also well narrated although the production standards are poor; hence the dropped star. Ten minutes in I no longer noticed the slightly muffled delivery.
This is an excellent book but is let down by the very poor quality of the audio. I downloaded in a high quality format but both parts of the book sounded like old AM radio. A great pity