RateMyProfessors.com

Using data for 426 instructors at the University of Maine, [researchers] examined the relationship between RMP indices and formal in-class student evaluations of teaching (SET). This study found that the two primary RMP indices correlated significantly with their respective SET items. First, RMP "overall quality" showed a correlation of r = .68 with SET item "Overall, how would you rate the instructor?" Second, RMP "ease" showed a correlation of r = .44 with SET item "How did the work load for this course compare to that of others of equal credit?" Further, RMP "overall quality" (r = .57) and RMP "ease" (r = .51) were each correlated with its corresponding SET factor derived from a principal components analysis of all 29 SET items. The researchers concluded "While these RMP/SET correlations should give pause to those who are inclined to dismiss RMP indices as meaningless, the amount of variance left unexplained in SET criteria limits the utility of RMP."[8] Formal in-class evaluations can only be completed by students who are registered in the course, whereas on RMP, anyone can post ratings, whether or not they have taken the course.

Two Stanford law professors argue that a legal framework for protecting online platform reputation should be responsive to the changing set of practices ushered in by the Internet and capable of resolving conflicts in a fair and satisfactory way. In light of recent failed lawsuits against online content providers, the professors advocate for "a new regime requiring such platforms to formulate an appropriate information policy providing transparency rules, including disclosing how aggregate evaluations are made and providing for a right to respond, to achieve a new body of communication “netiquette” for social evaluation in the online era."[9]

As RMP does not require users to create accounts or log in before posting, there is no guarantee that the reviews are actually posted by students who have taken the course. Professors who research controversial political subjects, particularly female professors and professors of color, often face harassment on RMP, when people who dislike their political opinions or scholarship can post abusive reviews by pretending to be students. For example, the RMP page of Rutgers University professor Audrey Truschke, a historian of Islamic India, is routinely used by Hindu supremacists to post demeaning and degrading reviews calling for her dismissal by Rutgers.[10]

Research on in-class evaluations shows that professor ratings increase when students rate the course as easy.[11] The same relationship has been shown for RMP. In an article in the journal Assessment and Evaluation in Higher Education, Clayson investigated what RMP actually rates and concluded that "students will give higher evaluations to instructors they judge as being easy. There is also a suggestion in these findings that, if students like an instructor (for whatever reason), then the easiness of the class becomes relatively irrelevant.".[12] Clayson concluded that "the majority of the evidence indicates that [ratemyprofessors.com] is biassed by a halo effect, and creates what most accurately could be called a 'likeability' scale." Other analyses of RMP class ratings have come to similar conclusions,[13][14][15] and some have concluded that professor attractiveness is also positively correlated with evaluation scores on RMP.[16] Felton et al. evaluated RMP ratings and found that "the hotter and easier professors are, the more likely they’ll get rated as a good teacher."[17]

A frequent criticism of RMP is that there is little reason to think that the ratings accurately reflect the quality of the professors rated.[18][19] Another criticism is that ratings have been shown to reflect gender bias toward the professors evaluated.[20] Furthermore, at RMP, "easiness", "clarity", and "helpfulness" are the only components taken into consideration and are not considered well-designed evaluations.[21][22] Edward Nuhfer argues that both Pickaprof.com and RMP "are transparently obvious in their advocacy that describes a 'good teacher' as an easy grader. Additionally, presenter Phil Abrami ... rated RMP as 'The worst evaluation I've seen' during a panel discussion on student evaluations at the 2005 annual AERA meeting."[23]

Single individuals are able to make multiple separate ratings of a single professor on RMP.[24] RMP admits[25] that while it does not allow such multiple ratings from any one IP address, it has no control over raters who use several different computers, or those that "spoof" IP addresses. Also, there is no way of knowing that those who rate a professor's course have actually taken the course in question, making it possible for professors to rate themselves and each other.[26]

Critics stated that a number of the ratings focus on qualities they see as irrelevant to teaching, such as physical appearance.[27] In late June 2018, several academics criticized the website's "hotness" score for contributing to sexism in academia. On 28 June, RateMyProfessors responded that while the feature was intended to "reflect a dynamic/exciting teaching style," it was often misused; the hotness rating was removed immediately.[28]

RateMyProfessors lets the student identify the course that they took with the professor and combines the ratings for all courses taught by the professor instead of providing separate ratings averages for each course taught.

Adjunct faculty are not always readily identifiable or verifiable, as such professors may work at multiple universities, change universities frequently, or maintain employment outside an academic setting.

After mtvU took over the website, a notes feature was added that allows professors to register with the website (using a ".edu" e-mail address) in order to reply to students' comments. Another option, called "Professors Strike Back", featured videos of professors responding to their ratings on RMP.[31] Additionally, in 2015, the site debuted a new series "Professors Read Their Ratings"[32] in which professors read and react to their RMP ratings. Students may also submit videos to RMP.[33]