Midwest2, Just because a school gives doctoral degrees doesn’t mean they don’t have good teachers, or that grad students actually teach the complete courses. Where I went to school, you could be fairly sure in most cases that each course was taught by a gadol hador in his field. The grad students may have been teaching assistants who marked homework and taught recitations, but did not give the main lectures.
They have to let some younger professors teach, or they will never learn how. Nevertheless, the level of teaching was tightly monitored.
My main complaint is when they let foreigners teach who can barely speak the language. This is really not fair to the students. In science today, there is such a huge number of foreigners who are filling a large percentage of positions at US universities, and nobody seems to care how poor their English skills are.