I think the student's come to class and expect class control, so as not to disrupt their education. I believe they expect to have the topic of a lecture well laid out and rehearsed prior to class delivery and that the instructor have first hand knowledge of the subject matter. I believe they feel they should receive what they paid for, I also believe that they should know what they are supposed to receive for information, and not assume such. In the end there should be a proper explanation of what each subject matter will include at the start of a course, so the student will know if that subject matter has been covered and they have received at least what they have expected too.