My husband is a professor and each semester we’re amazed that there is always a few students who accuse him of something, like being disorganized, while equal numbers will detail how thorough and organized he is (sometimes too organized in their opinion). Or some will say he is really funny and others complain about how serious he is. All in the same class. Each semester… It totally frustrates him since he has no idea how to respond and from what we can tell, these kind of ratings aren’t unusual. So to some degree these ratings should be taken with a grain of salt, especially if there are very few of them, unless you see a real trend year after year…