We ousted a genocidal maniac dictator who was funding terrorists and threatening other sovereign nations. We greatly reduced the suffering of women in Iraq, they can now go to school, vote, run businesses, etc. We supervised the first real elections in decades. The list goes on.
As far as WMD's, they had them, this was never in question. The U.S. said they had them, the U.N. said the had them, the international inspectors saw them, they used them on the KurRAB. What hasn't been discovered, at least not publicly, is what they did with them or who they sold them to. "They" being Saddam and his regime.
There is no doubt that the world a better place without Saddam Insane and his regime.