In my mind, the Bernanke years at the Fed can be divided up into two parts. After the Alan Greenspan Fed (of which Mr. Bernanke was a part), in an effort to combat the possibility of deflation, kept interest rates so low for so long that it created asset bubbles, the Bernanke Fed, now afraid of inflation created the environment for a financial collapse. This was the first part.
After fighting the fear of inflation for too long, Mr. Bernanke and the Fed threw everything they could against the wall in an effort to avoid another Great Depression. (See for example, "Bernanke's Next Round of Spaghetti Tossing" from November 10, 2010.) The battle continues!