Is there a professor rating site for that compares to pick-a-prof or ratemyprofessor?

one of the surest ways is to see whether the department has assigned who’s going to teach what class–once you’ve checked ahead of time–and, hopefully they’ve made the assignments–but it’s not always the case and course assignments are frequently made at the last moment; you can decide for yourself whether you want to be taught by a full professor, an assistant professor or an associate professor