I saw Fahrenheit 9/11 last weekend. I enjoyed the movie, which follows in the tradition of Moore's Oscar winning "Bowling for Columbine". Of course the movie has received scathing criticism from the republican right wing for its attack on Bush and his actions as President.
The film, however, has also received some serious criticism from the far left because of many things it doesn't say. Moore designed the film to get Bush out of office, but many of the left (the real left I mean, not the Democrats that are left-of-Bush-and-right-of-center) have said that Kerry and the democrats aren't much, if any, better than Bush and his cronies.
Now I know that democrats in general aren't much different from republicans (mildly in internal policy, not at all in international policy), but Bush in particular is quite bad. Now things may not get much better under Kerry. After all, he did vote to give Bush the power to attack Iraq, his wife is a billionaire heirress, and he supports 'war as policy' for international affairs. But with a $500B deficit, rampant war crimes (well, those were always there, but...), international hatred, and an increasing shift to the right in many countries, we can always hope that things will get better.
My favourite part of the movie is a clip from Bush II in 2000 at a Republican fundraiser during the presidential campaign:

This is an impressive crowd; the haves and the have-mores. Some people call you the elite, I call you my base.

~George W. Bush