pishicaca:
Personally, I’d be less interested in the size of the class but rather who is teaching it. When I read the OP, I was thinking more about the reputation of research institution professors being focused on their lines of research and graduate students, with TAs teaching many of the lower level undergraduate courses. It would be nice if there was a measure of the percentage of undergraduate classes taught by PhDs (or those holding the terminal degree in their field) to help with comparisons between institutions.
For this purpose, how do you count classes where the primary instructor is a faculty member, but there are associated discussion or lab sections run by graduate students?