As someone who has taught undergraduate university courses, I value the input I receive from students on course evaluations, but the current system of online system often has significant problems. 

I often receive very valuable feedback on from an anonymous, mid-term student survey (where students receive a very small participation mark for providing input). On the other hand, the end-of-course evaluations are now done online during the busiest time of year for students. Since this is done outside classtime, there is a tendency for only those who either love or hate the course to participate. 

The course evaluation system worked much better when it was done on paper during the final class which encouraged everyone to give input. Obviously, collecting the results from a paper evaluation is more labour-intensive, but perhaps using scantron or some similar technology would overcome that problem.