Awful

Professor Mustari dropped me without any notice that I was failing. He didn't even try to send me an email or tell me to come to his office hours so we could discuss me increasing my grade.

Good

Professor Mustari was a clear, consistent and quirky teacher. He would always ask if anyone had questions on homework problems in the beginning of class. The rest of the class time was spent on writing or teaching on the board. Your hand might get tired, but you will understand Mathematics. Also, no calculators allowed for exams. Overall, he's very kind and understanding, if you will just take the time to know him.

Awful

Prof. Charles wasn't helpful at all. He teaches too fast and he doesn't explain everything well. He even gets an attitude when you ask questions. He drops you out of class with no notice if your grade is low. He won't even tell you if your grade is low. He's simply just a person who isn't understanding at all.