In 2000, the World Health Organization health systems rankings placed our health system at the 37th position among national health care delivery systems. The world's health authority used five performance indicators in doing the assessment: overall  level of population health; health inequalities (or disparities) within  the population; overall level of health system responsiveness (a  combination of patient satisfaction and how well the system acts);  distribution of responsiveness within the population (how well people of  varying economic status find that they are served by the health  system); and the distribution of the health system's financial burden  within the population (who pays the costs)(1).
Currently, it is estimated that 45 million Americans lack health care insurance, hence unable to access care when they need it.This has contributed to the low ranking. While the U.K spending  just 6% of her GDP on health, is at the 18th position, the U.S is spending 16% to achieve this rating. There should be no reason why the superpower nation should leave 45 million of its population without health care insurance! It could be likened to a whole country having no access to health care!
While President Obama's health care reforms which has attracted the ire of the affluent is a step in the right direction, it is my sincere opinion that the superpower owes its citizens universal access to health care.
Reference
 1. World Health Organization Assesses the World's Health Systems. http://www.who.int/whr/2000/media_center/press_release/en/