Each time I come across a government website that has been shut down because of the current funding bill conflict, the stronger my opposition to ACA becomes. Why in the world would we put our health care system even partially into the hands of a government that can shut down access to vital medical services (not just national parks and websites) when the current leaders don't get their way immediately? I've seen "government-provided" health care used to buy votes--no free medicines for desperately poor people unless they vote for the guy in charge and his pals--in a Southeast Asian country. I know that Canada and some Scandinavian countries have mostly successful national health care programs. But we aren't those countries. The USA is a diverse country made up of much more than Minnesotans. (No offense. I love Minnesotans.) Not all parts of our Union exhibit the same work ethic, healthy lifestyles, and respect for the rule of law as we see in the Star of the North. There's no reason (other than partisanship and/or arrogance*) to think that everything will work as promised by ACA's supporters and that we won't end up regretting having given politicians and government bureaucrats such a large amount of control over our health insurance options.
Free markets aren't perfect. Nothing is in this imperfect world. But at least free markets allow for individual freedom.
* "Arrogance" sounds harsh. I don't mean it as a personal insult. When in school (K-grad), we are taught that if we get A's, we're smarter than most everyone else and could likely run things better than they do. Policymakers and would-be utopia-creators who seek to implement their own ideals over the experience and well-founded warnings of less-credentialed folk exhibit arrogance (i.e., an attitude of superiority manifested in an over-bearing manner or in presumptuous claims or assumptions.)
Update: In connection with my comments about arrogance, I refer you to this recent article on the history leading up to the ACA exchange debacle. If the bureaucrats involved can't even get a website right, how can they think their regulations will successfully manage 300 million people's health care access?