While I don't doubt that there are endless stories of bad care, especially among the non-unionized working class, the bulk of voters with middle class lifestyles do have good care. Which is why it's so hard to make it into an issue that drives political change.
> there are plenty of studies that show that Americans have lower expected lifetimes than citizens of peer countries, despite much higher per-capita health care costs.
Americans aren't dying earlier of diseases that are solvable with a doctor visit, surgeries, pills, or other easy medical interventions. The medically related early deaths are primarily because of overnutrition and lack of exercise leading to pre-diabetes, diabetes, high blood pressure, and heart disease. That comes from public policy mandating car dependence throughout society and huge subsidization of empty calories in the food system. Overeating and lack of exercise are problems that have been stubbornly resistant to the medical system's efforts to change behavior. There's also other heightened early death risks like car crashes, drug overdoses, and suicide, but few of these deaths could be prevented by increased access to the medical system.