> Students cannot possibly evaluate which of the teaching methods are better because they do not yet know what they are supposed to be taught. . . . it is pretty absurd to think that students could ever be objective in evaluating the teaching methods they are subjected to.

It's easy to recognize good teachers. They are first, understandable and second, motivating. If a teacher is not readily understood, or if they do not motivate the student to learn, then they are not very good. Children as well adults naturally use these metrics to evaluate not just teachers, but communicators in general.