In my school we have one notorious math teacher. The kids hate her (from what they say), but the parents love her. She assigns no less than 30 hw problems a night, the kids spend the class period just copying tons of overheads, and she basically has a "no nonsense" approach to discipline where the kids barely ever talk with one another. The kids come out masters of the material, and some even admit afterwards to missing her, but while they're in her class, it's all horror stories. Might I add that she also gives most kids their "first B" or "first C" or "first F" whatever it may be.