@always-a-geek: You make some valid points. However, I don't think these are fundamentally any different than what you see on Amazon or any site that hosts user reviews. I always take reviews with a grain of salt. You can tell a lot from how well the review is written, how many and the quality of facts, how well you agree with the reviewer on other products that you have tried, etc.
However, I think most college campuses and departments are tightly knit enough that students don't have to resort to anonymous comments on a website to get some idea about a professor. Let's face it, if your friend felt he or she was treated unfairly it's going to heavily affect your opinion of the professor. Students spend a fair amount of time each quarter or semester figuring out which classes to take, and the professor is always a big factor. They will get discussed.
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