Let me just say that there is a great discrepancy in the quality of teachers. Not only that, but certain teaching styles are best suited towards particular types of students.
The main problem with this is that certain teachers simply teach in a subject where it hardly matters how good or bad they handle it. Take math, for example. Math is a very cut and dry subject where the rules are set in stone. If a teacher can go through a problem, explaining each part, and the class can understand it. Of course, there are some teachers that can't even manage something that simple, or do not understand mathematics enough to handle it. However, this issue of mine is not related to the intellectual capacity of a teacher, but rather, their teaching style. As long as the teacher knows the material, and can explain the more difficult problems to students on a 1 to 1 basis if needed, they will automatically appear to be excellent teachers.
Next time you hand in one of those surveys, consider what area your teacher is in. Are they truly suited for that area? Maybe they shouldn't be teaching Compilers and instead should be placed inside Extreme Thumb Wrestling.