Bowling for Columbine was my first exposure to M Moore. I had mentioned to friends that I wanted to see the flick and was invited over for the day to have dinner and watch the movie which was playing on Pay-TV.
I enjoyed BFC. I was never bored at any point. M Moore asks a question in the movie about why the high number of firearm murders in the US, relative to other nations. It's a valid question.
Moore is a member of NRA and doesn't appear to have a problem with people owning guns. As you remember, he mentioned Canada has ~30M people and ~10M registered guns (and countless unregistered guns too) but not the same rate of firearm murder. The comparison was something like:
Annual handgun murders per country:
Germany: 360
Canada: 156
UK: 130
Japan: 39
US: 12,000
(these numbers, from memory, may not be exact but close enough for comparison)
One thing I will add is that changing gun laws in the US I doubt will change much except make it harder for the 'regular' honest guy to get a gun. It is the criminal element that is causing the problem. I know where to buy a gun here in TO (and Detroit) on the black market, so changing the gun laws here would make no difference either.
Here in TO the vast majority of hand gun crime involves the black community. Why this is so, is another question to which I don't have an understanding.
What I like most about M Moore's movies is he makes me think. He asks some good questions.