I'm at a club where the instructors' experience is immense. The instructors all have other part time jobs involving flying of some sort. They've been there, done that and are still doing and loving it! They are aircraft designers, airline captains, a previous job of one was a "test pilot trainer" in the RAF... most of all they love flying - and it shows.
They are instructing because they love passing on their knowledge. And they aren't even that intimidating! Despite their huge experience, they are still happy to admit they are sometimes wrong (even if that pretty much never happens). They are open to chat away to me and treat me as a person and fellow club member, even if I can't pretend to compete with their chat.
Of course, its not perfect - its run as a club, not a business - the number of available aircraft is small and organisation can be a bit chaotic sometimes, but I know I'm pretty lucky as far as a flying school goes.
My experience is that supervision is with a "light touch". My instructor lets me evaluate my own flight and the de-brief is a detailed discussion (not a lecture). I know myself whether I need to go over that particular lesson again or not (either I'll know before or after the de-brief!), and this will be confirmed by the instructor.
What I wonder about, is that students there are not generally "school leavers" but are either people who have retired or "young adults" working in other jobs (either to pay for the flying or learning as a hobby). I guess that means that my fellow students have a level of maturity that isn't going to be seen everywhere. Perhaps if the students were mainly "School leavers" the style of instruction would need to be quite different?.