In grades 9-12 I had pretty consistently good teachers. I had several amazingly exceptional teachers. This was in a town in the South, so it's not like we had exceptional resources or were some kind of culture magnet. Most of the jobs in the town were in textile mills.
I won't claim that that was the norm then. I know I was very lucky. I do wonder what has changed to make that kind experience even less likely.
Salaries for teachers may even be higher, on a relative scale, than they were then in our area.
The job of teacher has changed, I know. There is a lot more busy work and forms and reports. I've already mentioned having to spend so much time coaching for standardized tests and loss of respect. I know good people who have left the field over those things, and others who are going to retire as soon as practical.
One thing I hestitate to mention, because I think it is an otherwise good thing, but I suspect is a big factor, is that women can now get jobs in so many other fields. Back when my teachers were in college, intelligent women didn't have that many other possibilities outside of teaching and nursing. Back when men worked and women stayed home and raised kids, being a teacher was socially acceptable as a career for married women. Now it is the norm for more women to work, but also they have so much broader range of options. The brightest women who would in the past have become teachers now can be doctors, lawyers, or many other things more lucrative and higher status than teaching.