As is so often the case in these sorts of "countries that function quite well", the Scandinavians aren't doing too badly:

https://www.democracymatrix.com/ranking

USA is #36, a "deficient democracy". Not a surprise and sadly I can see it only dropping further in the near future.

The scale, interestingly, goes:

- Working Democracy

- Deficient Democracy

- Hybrid Regime

- Moderate Autocracy

- Hard Autocracy

Further details on methodology -> https://www.democracymatrix.com/conception/democracy-matrix