Yeah, others have critized the spines of my covers as well...
I have since changed them though, with the only real difference being the labels now.
I did not think this would be an issue, since people can easily swap them out with other labels if they do not like them.
But what labels would be considered the "standard"? (I have found at least two versions, that are frequently used by others. Can I pick either one?)
Do you have someone, that can verify german covers? Maybe I could contact them directly.

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On a side note.
I can understand that you would have to draw the line somewhere and that you don't necessarily want to let through the worst qualtiy covers.
But come on. What is the deal with demanding "perfection"?

I think having a cover of "mediocre" quality is still way better, then having none at all.
Most of the time I cannot find any decent ressource for my german covers. So I am often forced to recreate them from the englisch or french version.
It would have been easier to just retouch a "poor" quality cover, I found on TCP.

Maybe you should consider implementing a system similar to what is being used on
nintandbox.net.
Meaning some kind of quality meter and maybe a way for others to ask/provide for a retouched version.