You've probably read this before, but it bears repeating, Fahrenheit 9/11 is not an objective bit of reportage. Even knowing this I found myself sitting through the film and thinking "you didn't mention..." or "but that could also mean...".
It's entirely an openly biased attack on George W. Bush; the way he and his family do business, his handling of the September the 11th 2001 attacks on the US, his decisions to invade Iraq and Afghanistan. The technique is to skillfully weave fact, innuendo and emotion at a fast pace such that it's incredibly hard to unpick them while watching.
As such, it's a very well made film. It's powerful, sometimes overly invasive, sometimes sensitively handled. In particular the way he covered the attacks on the New York World Trade Centre was stunning, and almost worth an award on its own. Despite being mawkish and invasive; I found it genuinely moving when following of an American (working-class) woman whose son had been killed in Iraq, or the grief and anger of the Iraqi woman whose relatives had been killed by American bombing.
The message was that the rich and powerful Bush family and cohorts have conspired with the house of Saud and other rich Saudi families (such as the bin Ladens) to further enrich themselves at the cost of the working-class American and the people of Iraq and Afghanistan.
Moore isn't afraid of trampling on a few toes to get where he wants to go. I imagine there's 1,400 Dutch families who will be less than happy with the Netherlands being lumped in with Palau as the implied "joke" world-wide coalition while their sons and daughters are in Iraq. (There was no mention at all of the UK, Australia or Poland as part of the coalition, since of course they did play an active role throughout the war and aftermath and that would have spoiled Moore's point).
I felt while watching it a lot like I feel when reading the New Statesman magazine. I mostly agree with it, but it goes sufficiently past what I agree with that I can start to see the point of the people I'm disagreeing with. As such, it's a very valuable way to keep a level perspective.