Sorry .. I don't buy it .. just because someone has the "qualifications" doesn't mean they are a good teacher. Also - unfortunately for teachers they just aren't allowed to teach.
Someone said earlier that there is so much wasted time in school - and there is.. honestly sit down and TALK to some kids about what it going on... it's really very sad. There's so much time spent on the whole concept of "social skills" that there is very little time left for the kids to learn.
It has taken me a lot of time and observation to learn each of my children's different learning styles. Teachers with many students do not have as much time to learn the learning styles of each individual student and tailor the curriculum to them. With only five students, this is an advantage I have.
Just because someone was able to procreate doesn't mean they will be a good teacher either.