In quotes: Iraq report reaction – BBC News: Hans Blix, former chief UN weapons inspector: “Had we had a few months more (of inspections before the war), we would have been able to tell both the CIA and others that there were no weapons of mass destruction (at) all the sites that they had given to us.”
I guess really if we only waited, the Bush administration would have just found another false excuse in order to proceed. Check out some of the other quotes on that page.