As i mentioned in another post, if you measure success as creating a strong, prosperous, independent, viable democracy - then Iraq was an utter failure and so was Libya, Yemen, Somalia, Sudan, Jordan, Egypt and Iran. Which begs the question why does the US pursue the same failed policies over and over again. It turns out we were asking the wrong questions in 2005. If you measure success from the purview of the Yinon plan to establish Israeli hegemony over the entire middle-east then everything aforementioned - including all the death, terrorism, suffering, sectarian and religious strife, massacres and genocides, refugees crises, the rise of ISIS, the recent Al Qaeeda takeover of Syria - everything, was a resounding success.

https://en.wikipedia.org/wiki/Yinon_Plan