This study investigated effects of Ratemyprofessors.com and university student evaluations of teaching on students’ course decision making and self-efficacy in an ethnically diverse undergraduate sample. It also investigated if these effects were impacted by evaluation positivity. Additionally, the study explored if attitudes toward Ratemyprofessors.com was related to student gender, college class, and age. Participants were 73 undergraduates who were exposed to positive and negative evaluations about fictitious professors; participants were informed that the evaluations originated from RMP or university student evaluations of teaching. Evaluation positivity but not type influenced students’ intention to enroll in the professor’s course, but not how seriously they would consider the feedback. Evaluation positivity also influenced self-efficacy. Beliefs about and use of Ratemyprofessors.com were not related to student gender, college class, or age. Implications for student course decision making and self-efficacy for university students, faculty, and administrators are discussed.