The quality of care in America is second to none assuming you can get it without being literally bankrupted. 

The problems are with the insurance system, the lack of a government backstop and the impact it has on pre-critical care. If you show up at my ER we will treat you regardless of insurance, but half the time the time you wouldn't be there if you had regular access to a GP. Similarly you aren't likely to engage in necessary follow up therapy if doing so will literally bankrupt you  and so your condition worsens until you end up back in the ER. At that point we treat your critical issues and send you back out to repeat the cycle again. In the mean time all that care is basically done for free, which means to make ends meet we have to essentially overcharge people with private insurance, which leads to raised premiums which leads to less companies offering quality (or any) insurance, which leads to more uninsured people showing up at the ER, which starts the whole cycle again.