Finally got to see it. What surprised me the most was how moderate the presentation was. After hearing the howling from Republicans, I was expecting something outrageous. Sure, Moore's humour and ascerbic commentary is unabashedly partisan, but the material covered was far from controversial.
Practically everything Moore presented in the film I already knew about. Most of it would be common knowledge to anyone who used credible international sources for their news, or read any books on the subject. When I say credible news, I mean outlets like CBC, BBC, Reuters, and to a lesser degree PBS.
In fact, there was only one real surprise in the whole movie for me, and that was how aggressively the Marines recruited inner city youth.