Often enough the lecturer is the problem and cannot just be changed. That's a bold claim, sure, but in my experience not an uncommon opinion. "Lectures" I guess

Often enough the lecturer is the problem and cannot just be changed. That's a bold claim, sure, but in my experience not an uncommon opinion. "Lectures" I guess is directed at university classes, so your second paragraph seems slightly detached from the first one and from the topic of primary education.