Vast majority of humans can't comprehend how to rate any thing on more than good/bad scale. Even less people understand how you could rate some thing on 1-5 sca

Vast majority of humans can't comprehend how to rate any thing on more than good/bad scale. Even less people understand how you could rate some thing on 1-5 scale where whole range is in "good" category, so 1 is a somewhat good mark. One of the most obvious examples are schools. In my country before reform we had 1-5 marks. 1 and 2 were not considered valid mark but rather an absence of any score. So instead of five scale we had three scale. And since 3 was a placeholder for "passable" actual marks showing quality of the work were 4 and 5. And of course in time were invented unofficial corrections + and -, then ++ and -- etc. So when adults with 20-30 years of supposed experience of grading quality of work can't use even a simple 1-5 system then it is obvious that general population will fail at grading even more spectacularly. And thus we have 4.5 out 5 as "awful" score :) .