Is the professor's reputation taken into consideration by the admissions committee when they read her/his recommendation letter
While the idea of basing any important decisions on ratemyprofessor reviews is laughable, the answer to the spirit of your question is yes. If someone's writing a letter about your research, their reputation as a researcher matters a great deal. How am I supposed to judge someone's research potential if I have none myself?

As for teaching recommendations, in my field (math) this depends on what kind of position you're applying for. Having a teaching letter from someone in a teaching-oriented role (like a calculus coordinator or, if you're lucky, the Director of Undergraduate Studies) is always nice, but this matters a lot more when applying for teaching positions. In fact, I've heard that teaching letters from research superstars (or people who aren't specifically known for caring about teaching) don't get you very far at small liberal arts colleges.