Interesting that you raised your old thread back up...
You can be the biggest auido purists and ignore the cosmetics of the item (many of us do, many don't), but grading scale is there and it's very clearly described. There is a link in every ad.
http://www.canuckaudiomart.com/grading_scale.phpBased on your own description, that receiver was nowhere near 8/10. So if you make up your own grading scale, that's fine, but don't use pre-provided scale, and provide detailed photos of the damage.
8/10:
This item has seen some use, but still appears perfect from the front. A perfect front face plate includes the front top edge. Be sure and check this edge since it is very easy to nick. On speakers, all four front edges should be inspected.
Electronics may have 1 or 2 minor scratches (max 1/2" long, very thin) on the top plate or the sides of electronics, but again, the front must be perfect. There should be no signs of rack mounting. Chrome should have no pitting, but may have some discoloration in spots less than 1/4" diameter. Silk-screening has no separations, and the lettering shows no wear.
5/10:
This piece is visibly scratched and noticeably used, any major scratches on the front face qualify for a 5/10.
•Electronics may have several minor nicks or one major scratch on the front. Chrome is showing some pitting, maybe a flake or two has come off. Transformer covers show some rust, as do their mounting screws. Silcreening is separating from the glass in two or more areas, or the glass has one minor crack less than 1/2" long.