Lewis Thinks [x] About [y], So There!
Mark D Lew has a lengthy review of Moneyball: The Art of Winning An Unfair Game by Michael Lewis. He criticizes Lewis for not focussing on popular pitchers like Barry Zito and Tim Hudson. That would have been the expected route, and Lewis decided to follow a different one. Instead, according to Lewis' acknowledgements, interviews with those two pitchers were instrumental to the background stories that informed the book. Lewis does an excellent job summarizing both the book and its larger context (in terms of baseball, but not of baseball).
He calls the lack of an index a minor error. I think not having an index is a major error, mainly because after reading it, I wanted to use the book as a reference. (I bought the book for my dad as a birthday present but made him promise to give to me to read after he did.) "See?" I would say. "Lewis thinks [x] about [y], so there!" But I can't do that without an index. Dave Pollard has also called not including an index in recent non-fiction an annoying trend.