From my naïve standpoint, I see a dictatorship replaced with a democracy, many foreign debts to Iraq forgiven, the likelihood of increased oil production benefiting all Iraqis rather than just the ruling regime, a dramatic improvement in quality of life for the Kurds, removal of sanctions on all of Iraq, a government that has established friendly relations with its neighbors, creation of security forces that are far less abusive or corrupt, and a military unlikely to attack neighbors or its own government. What am I missing? There is no perpetual state of emergency like in Egypt, no Theocracry and ridiculously mismanaged economy like in Iran, no entrenched extended families pillaging the country’s resources like in Saudi Arabia. Even if you want to assert that Iraq will be dependent upon us for years to come, I've got one word for you: Israel.
I do not see many of these being strategic benefits accruing to the Unitd States. Most of these appear to be supposed benefits to the Iraqis themselves, which may be offset by the unknown tens of thousands of Iraqis killed and millions fled.

Also, how does Israel come into it? Is the idea that being a dependent of the U.S. is a good thing for the state involved? Again, I don't see the strategic benefit to the U.S. Also one could argue from this example that Jordan, Egypt, and the Gulf countries are also to one degree or another dependent on the U.S. yet many are negative examples for you.