I know some teachers and they are very good and very smart, hell even my friends. The problem in teaching is the unions. Only the unions. Where else can people get a guarantee for life, good wages, a pension of 1055 of last years earnings at 55, and 3 months of vacation with not a single wit of worry about doing well in their profession? Pretty much nowhere else.
Unions, particularaly teachers unions exist only to make the bottom of the barrel unfireable.
In my book 80% of teachers = good. 100% of teachers unions = bad, terrible, horrendous.