A quite sophisticated analysis.

Obviously it hinders the IO campaign directed towards the American public, since this is as noted the personal opinion of the soldiers who wrote it, not part of the official storyline.

Most striking to me are these paragraphs:

A few nights ago, for example, we witnessed the death of one American soldier and the critical wounding of two others when a lethal armor-piercing explosive was detonated between an Iraqi Army checkpoint and a police one. Local Iraqis readily testified to American investigators that Iraqi police and Army officers escorted the triggermen and helped plant the bomb. These civilians highlighted their own predicament: had they informed the Americans of the bomb before the incident, the Iraqi Army, the police or the local Shiite militia would have killed their families.

As many grunts will tell you, this is a near-routine event. Reports that a majority of Iraqi Army commanders are now reliable partners can be considered only misleading rhetoric. The truth is that battalion commanders, even if well meaning, have little to no influence over the thousands of obstinate men under them, in an incoherent chain of command, who are really loyal only to their militias.
Hits directly at the loyalty of the Iraqi security forces, upon which the entire edifice of our long-term strategy is built.

The Iraqi government is run by the main coalition partners of the Shiite-dominated United Iraqi Alliance, with Kurds as minority members. The Shiite clerical establishment formed the alliance to make sure its people did not succumb to the same mistake as in 1920: rebelling against the occupying Western force (then the British) and losing what they believed was their inherent right to rule Iraq as the majority. The qualified and reluctant welcome we received from the Shiites since the invasion has to be seen in that historical context. They saw in us something useful for the moment.

Now that moment is passing, as the Shiites have achieved what they believe is rightfully theirs. Their next task is to figure out how best to consolidate the gains, because reconciliation without consolidation risks losing it all. Washington’s insistence that the Iraqis correct the three gravest mistakes we made — de-Baathification, the dismantling of the Iraqi Army and the creation of a loose federalist system of government — places us at cross purposes with the government we have committed to support.
This IMO really nails the political situation in the country from the POV of the religious Shia parties, as well as providing the appropriate historical context.