On many accounts, it is better than most paid healthcare in the US and it’s objectively better than no healthcare at all, which is what many US residents are left with. But most importantly even the paid healthcare in Europe depends on the infrastructure and industry upheld by the free healthcare.
Yes, I live here. Have YOU used it?
Some poorer countries in Europe may have worse healthcare, but it usually has more to do with corrupt government not spending enough on it (but instead on fking stadiums...), and the much much better paycheck on the west (that is west Europe) causing massive migration of educated workforce throughout the years.
What objective problem can you bring up? Wait time is propaganda, not worse than in the US. Private healthcare is simply immoral and barbaric, a constant, externally determined demand for something should not be exploited. And one nation level insurance is the cheapest and best way for everyone (other than the billionaires owning private healthcare facilities and insurances)