Please don't base your opinion of ANY healthcare system on a movie made by Michael Moore. Hell, please don't base ANY opinions on his until you've done the research. He's known for leaving out or distorting facts to suit his own opinions regarding certain topics.
I have my issues with Sicko. I think that while Universal Healthcare can, and does to an extent, work for certain countries well enough, it would not work for America. On paper it's a beautiful concept, in practice I doubt it'd work for us.
While everyone may be able to get free healthcare, that doesn't mean that it's always readily available.
Example: I went to school in Buffalo, NY for a semester. I had to go to a 24 hr clinic one night because there was a lapse in my insurance and I was sick as all hell. It was crowded and I got to talking with a few of the people in the waiting room. The two I was talking to were both Canadians who crossed the boarder and were willing to pay whatever necessary for immediate healthcare.
So while Canada might enjoy free healthcare, that doesn't mean that it's without its flaws. Long lines and rationing isn't something you'd like when you need immediate relief, you know?
Not to mention, but sometimes dealing with the state is similar to dealing with an HMO. There are plenty of cases dealing with people who needed major surgery (hip replacements, pacemakers, etc) and were put on waiting lists. Sixteen months for a hip replacement means a lot of pain, not to mention a detriment to the economy since that's another person who can't work and is therefore now subsidized by the people. That adds up. Think of how many people already abuse our welfare system as it is, now imagine how that would be for healthcare? Don't think for a minute that the people who abuse welfare wouldn't abuse universal healthcare.
And you'd also have the problem of cultural history fighting against it. Any way you look at it even the mildly educated American can tell you that, as a whole, Americans don't like anything remotely socialist. Universal healthcare can be construed as socialist. We didn't fight the Cold War for nothing. You can dismiss that all you want, but when push comes to shove our history will be a huge hurdle when trying to get Americans to accept universal healthcare. Perfect example: look at the history of most Caribbean nations and look at how their history affects their current lifestyles and societies. It's not much different in the US.
Now don't get me wrong, I don't think that our current system is the best possible; but I do think it's pretty damn good for us. I don't think that universal healthcare is what the US needs, nor necessarily wants.