A course, or even basic learning about ethics seems a little weird.
Marking someone on their ethics seems wrong to me.
Whether or not something is ethical is subjective. It is true, that some ethics are widely shared by cultures, not killing people, not stealing, but when we're getting into case studies, having right and wrong answers for the subjective ethics of a group of students is wrong.
Suggesting that something is more or less ethical is fine. Telling someone that their code of ethics is wrong, is in and of itself, unethical. At least by my system.
Ethics studies are silly.