It really depends. We had one teacher who retired at the end of last year, who had taught parents of people in our class, and everyone was like "Oh, she's a great teacher!" Get a new teacher this year, and discover that old teacher is basically still teaching to the old-style syllabus, hence the fact that we're all totally lost when new teacher starts talking about certain things.
The old one was just so set in her ways that she refused to change, and it was dragging her students down. Her replacement is mid- to late-thirties, and she's a brilliant teacher. Sure, she doesn't have the same experience, but she hasn't become stuck in outdated ways. She also understands the students better, because there's not such a huge age gap (and she's got a daughter in year 8, which helps), so she's much more aware of ways of teaching that are likely to connect with us.