Yes, bad teachers can absolutely ruin it. I had a stats prof that just destroyed the class. I failed, along with a great many students. Took it again with so

Yes, bad teachers can absolutely ruin it. I had a stats prof that just destroyed the class. I failed, along with a great many students. Took it again with someone else, learned the material, and got an A. The difference was that one teacher could present the material in a way that people understood, and the other could not.