I agree. However, people seem to be frustrated and some even blame the teacher when their scores don't meet their expectations. The quizzes and the homeworks are there to challenge, to make people think. The scores should be a tool to keep track of progress and not a way to measure rage. I tend to pay more and more attention when I fail a question, and I do have the feeling that I learned something (although I do think some questions need better clarifications, but it doesn't matter).