Disc Condition Scale aka "The Sleepy Scale"
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source: https://www.dgcoursereview.com/forums/announcement.php?f=9&a=2

10 - Never thrown, no ink, brand new condition
9 - Field tested or used for one or two rounds
8 - Lightly used with very minimal wear
7 - Used with some minor dings or scuffs but still in good shape
6 - Typical used disc with the usual dings, scratches but still worthy
5 - Kinda beat, significant wear, has lost a good bit of it's stability
4 - Beat up turnover disc with some evident war story wear
3 or under - Beat to Hades dog chew toy