There's no debate on his strong knowledge about the subject he teaches.

There's no debate on his strong knowledge about the subject he teaches. He also makes sure to teach with every little details. The problem is he looks for perfection in the answers and if it's not there, he grades it extremely poorly. I used to find all the courses he taught very fascinating at the beginning, but his poor grading ultimately made me lose the interest on the subject itself. There's no way a student will enjoy studying a course when they are fighting to pass the course