Best professor for next term at university?

I’m looking for who might be a good professor. I’m a graduate student in university and I’m unsure about what classes I want to take next term. I’m very conscientious about what the professors will be like in any class I choose, because they can make the difference as to whether a class is interesting or not. Is there a way to choose which professor is best? Is there anyway I can find out about how good a professor might be at teaching his subject and/or how much the students they’ve had like the professor? Are there universities which rate their professors according to student opinion? Or even qualifications?

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http://www.ratemyprofessors.com/

They have over four million ratings for different professors in universities throughout the United States. Check it out!