System Flaw

Is there a system which is perfect out there? Just so many personal views and questions I have regarding the school system. Does the bell curve really work well with peer evaluation, or vice versa? How are 1101 modules suppose to be exposure modules, if the lecturers unintentionally deter students from taking the major by making the modules tough to understand? How is moderation actually done, if any, when tutors have such differing standards? Does 'A' for a module last year, mean 'A' for a module which is taught by a different and less interesting lecturer this year?

But then again, I am thinking and expecting too much. Must be the exam stress.