RateMyProfessors

I use a bit of caution when reading these, mainly where there is a small sample of ratings available for the instructor. Such as the case of two ratings, one is 0/5 (like someone who blamed the instructor for everything gone wrong) and another 5/5 (Someone who truly has done fair work and evaluation in the class to come to this), which average to some 2.5, which will not be helpful in that case. Otherwise, considering the comments available and see if it is the student or the instructor that has issues concerning the ratings.

Since I remember using this once and found out that a certain instructor really did not really rate high, but when I actually went through the class, and did the work accordingly, it was not as bad as the comments made it out to be, so in that case, there might have been issues with the students rating the instructor rather than the instructor itself.

Yes, naturally when there are cases that have a strong overall positive (or negative) comments, then it is a pretty good indicator on the instructor, but that is not always the case, but yes, still useful in getting an idea of what's ahead in a semester definitely.

Aw, here I thought we were going to have some hot professor action going on.

Well, if you go to the site and the page to rate a professor, you do get this: