Many higher education institutions use student satisfaction surveys given at the end of a course to measure course and instructor quality. But is that really a true measure of quality? All things being equal, an instructor who teaches a rigorous course will likely score much lower than an instructor whose course is a little less demanding.
Then there’s the whole timing of the satisfaction surveys. For the most part, students are simply glad the course is over (even if they liked it) and put little thought or time into completing the survey. Unless of course they know they failed, in which case you will get a detailed assessment of how you are boring, inflexible, out of touch, or otherwise unfit to teach.