First, in my experience, if an investigator doesn't get admissions in the first two hours or less, anything after that is suspect. Most of the cases I was involved in with confessions, most of the time it was in an hour or less. What the hell do they talk about for eleven hours?
Second, a lot of work the FBI does gets no attention in the press, which is likely a good thing. The child exploitation unit does really good work. The whole thing isn't broken, just some parts. Oh, and if you want to blame someone in this case, blame the Justice Department as a whole. FOB collects evidence, but the US Attorney gets the indictment and prosecuted the case.