I did a little bit of refining (although ranges of visual conditions are still lacking) which brings the overall grading to way more realistic results... you'll see at the example coin ;-)
Any suggestions, correction of spelling errors, definitions I might still get totally wrong are very welcome!

So there occure several changes to the example coin: C-BTC-CF-2-4-3
"2" because I used 07/2015 as starting point (like Denarium states on their homepage to have started funding their coins), close to 7 years in business with no databreaches or open issues known to me means 3 steps up the trust-ladder. As much as I like the idea of open look-up databases... it makes the addresses prone dust-transactions (which isn't affecting the rating for now).
"4" is self-explaing.
"3" because of lack of meaningful divisions => the coin is as good as it can be (in relative terms a "0") although I'm fully aware that in other series other standards apply... like "Polished Plate - PP" an loads of other numismatic terms.