The following are actual comments from MIT's Course Evaluation Guide:

"The class is worthwhile because I need it for the degree."

"His blackboard technique puts Rembrandt to shame."

"Textbook is confusing... someone with a knowledge of English should proofread it."

"This class was a religious experience for me... I had to take it all on faith."

"The instructor would make a good parking lot attendant. He tries to tell you where to go, but you can never understand him."

"The course was very thorough. What wasn't covered in class was covered on the final exam."

"He is one of the best teachers I have had. He is well organized, presents good lectures, and creates interest in the subject. I hope my comments don't hurt his chances of getting tenure."