If the US, versus the Canadian health system is so good, why are Americans so unhealthy compared to Japanese, Swedes, Canadians, French etc. i.e countries with public medicine (actually I don't kniow much about the japanese system exept it seems to work a lot better than the US)

Read the numbers quoted From the From Journal American Medical Association, Vol 284, 483-485 (a well known socialist magazine)

“Of 13 countries in a recent comparison, the United States ranks an average of 12th (second from the bottom) for 16 available health indicators. Countries in order of their average ranking on the health indicators (with the first being the best) are Japan, Sweden, Canada, France, Australia, Spain, Finland, the Netherlands, the United Kingdom, Denmark, Belgium, the United States, and Germany. Rankings of the United States on the separate indicators3 are:
· 13th (last) for low-birth-weight percentages
· 13th for neonatal mortality and infant mortality overall
· 11th for postneonatal mortality
· 13th for years of potential life lost (excluding external causes)
· 11th for life expectancy at 1 year for females, 12th for males
· 10th for life expectancy at 15 years for females, 12th for males
· 10th for life expectancy at 40 years for females, 9th for males
· 7th for life expectancy at 65 years for females, 7th for males
· 3rd for life expectancy at 80 years for females, 3rd for males
· 10th for age-adjusted mortality