Mixed. There were a number of reasons to invade Iraq, not the the atrocities pervaded by the likes of Saddam. If his regime could be toppled and replaced with a more stable system it would certainly have been worth it. It was quite obvious to all that the UN was wasting everybody's time, and has continued to do so in a number of issues since. Certainly the American military had the capacity to win a relatively quick war.
But. While there were reasons to invade Iraq, many more were invented to make the war a more pleasing to the American people. What WMDs? What terrorists operating from Iraq? There was no excuse to invent reasons to go to war, making the motives for war a highly dubious prospect. In the long run it has proven clear that there was no decent stategy for rebuilding Iraq, and the nation has had to suffer at the hands of suicide bombers and ineffectual puppet politicians alike. The rhetoric which was presented to the UN and people of America hardly helped convince people that the war was justified and has undermined a lot of the credibility the US possessed.
So while in principle I would have supported a war with clear reasons, as it stands this war was ill-founded and ill-planned and could have been resolved in other (and quite probably better) ways.
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