It's ironic that you point this out - It's ultimately this whole thread -- and the whole book this thread is about. I highly doubt any of the other commentators in this thread have bothered to read the book. FrancoFan especially like to base his knowledge on oped's and book reviews and not from source material.
But hey - Malcolm Gladwell HIMSELF says that he doesn't fully research the topics he writes about. He says it's much more fun to cherry pick a few provocative sources and run with that.
Your comparison between Freeh and Snedden is valid. They were both paid to lean towards an outcome, were both biased with personal goals and feelings, and each failed to interview key players. Have you seen the transcripts of Snedden's interviews with any of the Sanduskys, any of the Paternos, other Penn State coaching staff members, MMQ, John McQ, Dranov, Raykovitz, or any of the alleged victims? No? That's because he didn't talk to ANY of those people. Calling him credible on this (Sanducky specifically) is absolutely ridiculous.