Anecdote: When I started high school, we had a teacher in literature who everyone just hated. He was harsh, his tests were hard, the subject was boring, etc. In the third year though, most of us realized that he was very good at teaching, and the things he taught actually stuck. Many years after high school, I consider him the best teacher I've ever had.

He never tried to make himself popular, but he was relentless when it came to teaching. A student evaluation program would have been disastrous for him, and everyone would have been worse off.