According to Hugh Hewitt, the ISG failed to interview the right people (my emphasis):
Of the 43 "former officials and experts" consulted --including Mark Danner of the New York Review of Books, Thomas Friedman, Leslie Gelb, Sandy Berger, Anthony Lake, Ken Pollack, Thomas Ricks, and George Will-- the ISG did not find it necessary to talk with, say, Victor Davis Hanson, Lawrence Wright, Robert Kaplan, Mark Steyn, Michael Ledeen, Reuel Marc Gerecht*, or Christopher Hitchens. The ISG did talk with Bill Kristol. I wonder how long that sit down lasted?
*Hugh later discovered that Reuel Marc Gerecht was actually part of the Expert Working Group
Remember: You only have two days to get in your VDH post. Don't delay, pontificate today.