Back damage--and grading craziness

[GregMitch34]

We tend to focus on odd ways grading companies judge condition--on the front of cards. But at least there are posted standards to refer to and "errors" that seem clear. Yet the back--and wildly different ways they seem to get judged--get little attention. Stains, paper loss, dirt marks etc. all produce varying impact on grades--and equally scare some people off while not bothering many at all. Wonder how others feel and judge them personally--or can describe what you THINK the grading company standards are. Sometimes it seems that almost anything goes for a "4" or under...