I don't use it to base opinions on my professors before I choose them, but I use it during the semester to see if my opinion corresponds to everyone else's about the professor. Sometimes it's way off, but for the most part, it's pretty darn accurate. At my university you have to worry about getting the class you need, moreso than worrying about which professor to take for the class you already have.
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Off the record, on the q.t., and very hush-hush.
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