While RateMyProfessors is used in the UK, the name doesn't quite work, since at most UK universities, only a small proportion of the faculty is/are professors. The full range of academic ranks varies some from university to university, but typically the entry-level position for an academic on a permanent teaching/research contract is Lecturer, and Professor is the highest rank. In between my university has Senior Lecturer and Reader. But whoever takes the teaching role for a course is the course's tutor. Another role one can take is that of personal tutor, a term which is being replaced at my university by academic advisor, and which at my US undergraduate university was simply called advisor: the role in which one gives guidance (and pastoral care) to a student with respect to their overall academic development, rather than just for a particular course/class/module (whatever you want to call it).
In most American universities, the entry level for academics is Assistant Professor, then there's Associate Professor, then full Professor. All of these people are called Professor. So, in the US, I was Professor Lynneguist, but in the UK, I'm just Doctor Lynneguist. In the US, a student might ask another Who's your biology professor? But in the UK, one would ask Who's your tutor for biology?
In AmE, a tutor is generally understood to provide private tuition. (That sounds ambiguous in AmE, since tuition in America usually refers to (BrE) school/university fees. Tutors provide tutoring or tutelage--not fees!) When I was a (BrE) postgrad/(AmE) grad student, I was a logic tutor for student athletes--meaning I helped them understand the lectures that had gone over their heads. In the UK I am a tutor in that I am the person getting paid and doing most of the talking in the classroom--the one whose lectures might go over the students' heads. The (American) RateMyTutor site is about people who provide private lessons to school children.
That reminds me of another thing... Lesson in AmE most often refers to the kind of thing that a private tutor might do. One has piano lessons and flying lessons, etc. School teachers make lesson plans, and may refer to the mathematical part of the day as the math(s) lesson, but once the (AmE) students/(BrE) pupils are old enough to have different teachers for different lessons, the lessons tend not to be referred to as lessons in AmE, but instead are called classes. (This ends up being ambiguous, as the class could be the activity or the group of students.) I thus find it strange when my BrE-speaking students refer to my lectures or seminars as lessons (as in: Could you send me the notes from yesterday's lesson? I had to miss it because my housemate was having her poodle dyed and the bath flooded and ruined my bus ticket so I had to stay at home and watch Countdown instead.). It sounds oddly childish to my ear.
As of this moment, no one has bothered to rate me on that professor-rating site. I simultaneously consider myself lucky and feel a little hurt.
P.S. A second-hand addition to the Canadian count: someone else wondered to Better Half whether I was Canadian. We're now into double-digit Canadian count.