The final report:
Despite some skepticism from many areas within the international community, in hindsight, it has now become clear that the UN inspection system in Iraq was indeed successful to a large degree, in fulfilling its disarmament and monitoring obligations. Crucial to the inspection system was the underlying backing of military, political, and economic pressure particularly from the permanent members of the Security Council. While it will be for others to judge the level success or shortcomings from the UN inspections regime in Iraq, it seems clear that without such international pressure, even limited success was not assured.
See also Robert Farley and Arms Control Wonk. In the immortal April 2003 words of Charles Krauthammer, "Hans Blix had five months to find weapons. He found nothing. We’ve had five weeks. Come back to me in five months. If we haven’t found any, we will have a credibility problem."