As I say, my evals are at the very top of the department---I've never gotten a perfect, although a couple of my colleagues have, but I've come close. But it does contribute to the mentality that "you are here to serve me," as opposed to, "I am here to learn from you."
This, then, results in curriculum that have certain structures (won't bore you with details) which result in the fact that we only teach U.S. Civil War once a year in the SUMMER, never during the regular school year; and haven't taught the "Age of Jefferson/Jackson" in 10 years.
Still, if I were to take a U.S. Civil War course, as a student I could certainly tell if I was being taught about the Civil War or if the teacher had hared off into European Colonial African history and slave trade with occasional references to the Emancipation Proclamation.
I may come away with world history knowledge of the mid-19th century that would serve me later, but did I really learn about the U.S. Civil War? Did the teacher serve the need that I paid for? Yes, I am here to learn, but I am here to learn what I was told you'd teach.
It is the nature of a technical service industry that you are paying for the expertise of a professional, but you wouldn't seek that professional out if you didn't have a specific need to be filled. If a professional insists that your needs are secondary to what he wants to provide, then you are just going to end up with your needs unsatisfied. At some point, you are going to decide that the professional simply isn't providing the service advertised.