In 99% of my classes, all of my papers and assignments have been graded with percentages. I am used to getting 95-100% on all of my papers and assignments. In one class I had recently, though, I got something back and I had a 40 on it! Imagine my panic and confusion! When I emailed the instructor about it, she explained that the assignment was worth 40 points, so essentially I got 100%.
I didn't understand her logic at switching from the format that everyone had been used to, all thru their program at this school. Some items were worth 5 points, some 50, it was just ridiculous and hard to follow. I never knew where I stood.
Therefore, I think it is very important for an instructor to follow te same grading format that is standard at the school. Otherwise, it just causes unnecessary confusion.