You're laughably uninformed. WHO ratings are rigged to give credit to health systems with socialized aspects. WHO rating the US vs. socialized systems is about like asking new york yankee fans to rate whether the new york yankees or the boston red sox are the greatest all time baseball team. 
Also, WHO has notoriously allowed data to be rigged by reporting countries - eg (famously) saying the US infant mortality is high. The real reason is the US counts the death of preemies as infant deaths, where most others don't. Get a clue.
BLLLLLAAAAAAAAAAAHHHHHHHHH HA HA HEEE HEEEEEEEE CHORTLE GIGGLE YAAAAA HEEE HEE HARRR YUK CACKLE HA HA HEEE HEEEEEEEE GIGGLE CHORTLE YAAAAA HEEE HEE HARRR YUK CACKLE HA HA HEEE HEEEEEEEE GIGGLE
And who did the rating??? A component of the UK's socialized NHS. Hey, here's an idea: you and your friends play me and my boys a game of baseball - my team gets to be the umpires too!
Comparisons of socialized health systems vs the US are always rigged from beginning to end.
The health of a nation depends on all kinds of factors not included in rigged studies created by non-impartial sources, and other than the health system itself. Do euro countries have the rate of violent crime the US does? Nooooo. Do they have a huge underclass like we do, which is addicted to all kinds of health destroying behaviors such as illegal drugs, unhealthy food, gang warfare, unprotected sex etc? Nooooo. Do they have 20 million illegal aliens who screw up the stats? Noooooo. Do they fight major wars and have millions of wounded veterans from several wars? Noooo. Do they drive cars as many per capita passenger miles as us? Noooooo.
Give it up. You've got nothing. 
