I know that for some best is still pretty poor, but as an outsider visiting a school it looks terrible to have semi illiterate work up on display. I was in a sec school today where almost NONE of the work was correct.
it's a condunrum - celebrate indivdual achievement (not necessarily knowing that the kids might have learning issues and therefore presuming the school has low standards) OR to insist all work up is the very best - therefor acting as a good role model for other kids.