We do spend vastly more than other countries do (though it's worth remembering that other countries fund universal care with high-end marginal rates that kick in around teacher salaries, and the typical citizen of a single-payer system has less income after factoring in health care than in the US). Certainly, if you're going to critique the system, spending is a good place to start, and this post avoids the trap of centering its coverage on private health insurance --- which is probably not the problem.
It's difficult to track infant mortality across countries, because countries have different standards for reporting infant mortality. My understanding is that our ranking there is in significant part an artifact of measurement.
The same thing is likely true of the "multiple chronic conditions" thing. There is a significant problem of overdiagnosis and overtreatment in the US. Specialist care is harder to obtain in many single-payer countries (talk to a Canadian), and fewer procedures are done outpatient (talk to a Brit). Our system is structured to quickly find diagnoses and move patients through a funnel to billable procedures.
On the other hand, there are other metrics of health care quality. For instance, you can easily get a ranking of health care systems by breast cancer survival likelihood, and the answer to that question is hard to square with us having the "worst" health care in the world.