<p>xiggi can speak for himself of course, but I think it is pretty clear that he didn’t mean a grad student filling in for a lecture or two in a pinch, or being given an assignment as an undergrad where the prof would obviously be there as well. But to have a grad student actually be responsible for an entire lecture course…well, I can understand how people paying $50,000 a year to get a high level education could object to that.</p>