The best alternatives to Rate My Instructor are The Infatuation, Rating, and Rate My Professor. If these 3 options don't work for you, we've listed a few more alternatives below.
Rating is a lightweight app for managing ratings using user-created lists. It allows you to Add ratings for your favorite stuff, such as movies, TV shows, food or anything else. Create lists for all these things, which would allow you to easily manage everything you've ever rated.
Yelp is a business directory service and crowd-sourced review forum, and a public company of the same name that is headquartered in San Francisco, California.