It was actually a variety of reasons, only one of which was his failure to comply with the UN regarding WMD's

But that's not how Congress and the American public were sold on the war. We were told that the U.S. was just enforcing the UN Security Council Resoultions. That was the only thing that made the war justifiable, and the only thing that created a situation where Congress would approve a bill giving Dubya the authority to use force in Iraq. It's a classic bait-and-switch. Hence my argument that the war cannot be claimed to be successful because the ORIGINAL stated objectives were not met.