OK, "Bowling For Columbine" had about one good hour of material. The Southpark clip was damn funny, as well as the interview with M. Manson and Tim McVay's relative. The Charlton Heston bit was lame, as was the Canada/US comparison. Moore is at his best when he's blurring the lines, not drawing them.
However, everything I've read about this film leads me to believe that it's much like his "Stupid White Men" book - crap. Just a paranoid polemic that gives propaganda a bad name.