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Is it generally useful to meet with professors to discuss exams? Should this be reserved only for exams on which you did mediocrely or is there any use in meeting with professors for whom you did decently?

As with most things, there is no general answer, it depends on the prof and how well you did on the exam. Obviously if you did worse you have more to improve on and I would prioritize speaking to those profs first. I personally would feel weird going in for feedback on an A exam, but I'm sure many people do. But don't feel like you have to go in for feedback, I never did and did just fine (granted my GPA stayed relatively the same throughout law school so far).