I don't grade releases in my collection by the content/quality of the music. Instead I grade according to a) the location of the leather image, and b) quality of the image.
This is how it works:
5/5: The creme de la creme, for whatever reason I
LOVE the image on this release. Pure sex!
4/5: This release has a leather image on the front cover.
3/5: This release has a leather image on the back cover
2/5: This release has a leather image somewhere on the inside of the packaging (ie inner sleeve, inside the CD booklet, or CD tray insert).
1/5: This release will have a leather image as an extra to the packaging (ie a poster, photo, postcard etc).