How do I voice my opinion that the teaching of students is being neglected?
The fact is that institutional norms and expectations regarding teaching vs research for faculty vary widely. At my current institution, teaching is very important. At my previous institution, no one really cared. Basically, I would not voice this opinion in any strong way unless you want to make your life difficult. It would only work if the faculty member you are working for is disliked and the person you complain to is firmly on your side.
I did have a similar situation as this in my PhD institution and &quot;voiced my concerns&quot; in a very tactful way. I argued that the course was extra challenging because it was a new advanced level course and had not been given enough resources. (Note that I was careful to say nothing about the effort or quality of the instructor.) The department was able to pay me extra as a TA to take over some of the instructor’s responsibilities. But the instructor was someone who got on the other faculty’s nerves, and my advisor was the associate dean for academics.