The problem is, he hasn't actually admitted his biggest mistakes. As far as I know, he has never taken responsibility for the credit and housing bubbles.
There's little doubt his loose monetary policy contributed. That said, those bubbles could never have been as severe without wall street's catastrophicly optimistic pricing models and reckless lending practices. Wired has a good description of how pricing models contributed at http://www.wired.com/techbiz/it/magazine/17-03/wp_quant?curr...
