I agree 95% with the sentiment on these 12 pages. However in the interest of fairness and since everyone else is giving anecdotal insights, I do want to give UHC props.
I have a gentic disorder and I live in Texas. I have an aunt who has the the same one who lives in the London area. I've had Anthem, BCBSTX, Aetna and UHC.
Getting coverage of a biologic that I need 3x a year has been infinitely easier with UHC. They approved it the first time without appeal or needing to harrass my specialists with interviews and gave me the name brand. The other insurers were horrible. Constant denials and appeals and then finally approving with a biologic similiar (generic I guess?) and on a more elongated schedule, 2x a year versus the 3, than requested by my docs.
My aunt in London and dealing with the NHS?
Horror stories. Very basic care and medicine (generic, low efficacy and therapeutic relief pills versus the very expensive infusion therapies) and the wait if you are ever approved is so bad. She had to go on their version of disability because she couldn't get access in a timely way to function at even a mid-level. She's doing fine now after having had to spend a few years at the front of this disease getting it into a remission state, but there was suffering and loss, etc. from not being able to flex. I should also add she's not wealthy and very middle class and working class.
All that to say, NHS is amazing for the flu or covid or insulin. It's amazing for 90% of the healthcare population.
But if you have a rare or aggressive and specialized disease and need specialists and expensive meds (the vast, vast minority) there is no better healthcare than in the U.S.