The medical establishment already kills over 100,000 people every year as the result of medical errors. Countless more people stay sick longer or get sicker because of such errors. For example, someone just told me that because of an error in surgery, he became blind.
Under President Obama's health care proposal, we'll be providing health care for 45 million more people with the same number of doctors, nurses, hospitals, MRI machines, etc. That 45 million has greater-than-average health care needs while having lower average income, and thus will often get low-cost or free health care under the Obama plan. The result will be that even more of the people who do fully pay into the system will stay sicker longer, get sicker, or die.
From where I sit, the answer is a two-tier system: a basic level of care for everyone and a higher level of care for those who pay into the system. Alas, I doubt seriously whether the Democrats could ever support such a plan. Their core principle is that equality trumps merit.