I have had some mixed feedback on the same course. One student was so keen on my work that she named me in response to a question of who was significant for her studies and made some very generous comment.
In the anonymous feedback for the same course, I generally got good feedback but for each category, there was one who wrote negative comments. I can entirely understand that there are different opinions and students should give their honest views. However, some of the feedback is demonstrably (or could be demonstrated as) untrue - e.g. feedback that messages were not replied to. I am sure that one rogue person who seems to maliciously criticise would be ignored in the greater context but I wonder whether there should be a need to demonstrate criticisms are reasonable. I suppsoe this might affect anonymity.