1. Propogranda is not serious political commentary because it is not actual thought -- it pushes an agenda and is not impartial.
Most political commentary is full of partiality, bias, and opinion. That's what commentary is... it's an explanation, an analysis, and in many cases a spin on a certain political view. I don't know where you get that it doesn't "require thought" though. Even if you think every word that Moore says is a lie, it still wouldn't make sense to say that it's not actual thought. Opening a beer requires thought.
2. Michael Moore's films are propoganda.
I don't disagree with that, but at the same time, propaganda in and of itself is a neutral term... because something is proaganda does not immediately make it villainous (I'm not making a claim on Sicko either way as I haven't seen it or researched where his lies might be).
3. Michael Moore's stuff is not serious political commentary because it is not actual thought -- it pushes an agenda and is not impartial.
Again, how you can say that Moore isn't engaging in actual thought doesn't make any sense to me... and again, political commentary is subjective as hell. I think Rush Limbaugh is one of the biggest liars in the world, but I don't deny that he makes serious political commentary.
On agendas: agendas, like propaganda, are not inherently bad. Like the mole-mating documentary example I illustrated earlier... documentaries have an agenda, even if it's something as simple as making the viewer gain interest in moles.
On being impartial: he's not a news reporter, nor is he a news journalist. To my knowledge, he's never claimed to be anything more than a film maker. He's free to be an opinionist, and he's free to use film to express his opinion. If he were an anchorman or a government official, I'd use that impartial/agenda argument against him, but that's not who or what he is.