The final word, from the New York Press:

Michael Moore may be an ass, and impossible to like as a public figure, and a little loose with the facts, and greedy, and a shameless panderer. But he wouldn’t be necessary if even one percent of the rest of us had any balls at all.
…
Say what you want about Moore, but he picked himself up and _did_ something, something approximating the role journalism is supposed to play. The rest of us — let’s face it — are just souped-up shoe salesmen with lit degrees. Who should shut their mouths in the presence of real people.

*UPDATE*: Okay, that wasn’t the last word. The last — and to my mind, best — word on Moore’s movie is contained in this Paul Krugman column. It’s a must-read.