Regarding the NHS, my fiance's opinion is essentially that it has its faults and could be improved; however, he believes that it is nice to have the peace of mind that if you lose your job, or suffer some kind of other financial blow, you'll still be able to have access to healthcare and you won't have to go through the thought processes of, "Well, I feel rather sick, and I've been feeling sick for a long time and nothing OTC is working...and a doctor visit will cost X but I've also got to pay for the heating bill this month. Hmmm. What should I do?"
As for doctor quality, he says that NHS doctors are probably like the spectrum of doctors anywhere else. You get some superb ones, some awful ones, and many good/fair ones. But if you don't like the one you have, you can [usually] get another.
The closest city to him is Bristol. I've been to a doctor's surgery in his village, and been to a hospital in Weston. I found access to the NHS and doctor qualities there no different than around where I live (granted, I ended up in the hospital Christmas Eve and Christmas and most people were probably home celebrating). If I moved to the UK, I suspect I would stay with him for a while until I found a job. Once I found a job, we would likely be moving east as that's where the jobs in my profession usually are.
I think the decision is a bit difficult because we both know my job is definitely more stable and lucrative here. However, we believe with my history of chronic medical issues, the NHS would offer me a better quality of life in regards to covered accessible medical treatment.
I have only been in the UK for a cumulative total of about a month (a week here, a week there, etc). But from my time in the UK, I love it. I don't know if a cumulative month is long enough for me to be able to say, "Well, I like the UK lifestyle more/less than the US lifestyle."