UPDATE: Money quote:
One additional point: Petraeus's counterinsurgency stands out not just for its conceptual ambition and the skill of its execution but for its humanity. There were those who argued that the U.S. military could not succeed in counterinsurgency because Americans were not tough and bloodthirsty enough. They said that brutality was essential in subduing insurgents and our humanity would be our downfall.
They were wrong. The counterinsurgency campaign of 2007 was probably the most precise, discriminate, and humane military operation ever undertaken on such a scale.