There is absolutely no "TRUE" way of determining how an album is scored, as OPINIONS DIFFER. It's kinda like religion... isn't it?
MY RATING SYSTEM:
100% - 75% - Listenable / Reviewable. Ranges from: Orgasmic; Excellence; Awesomeness; Good; Somewhat lacking, though definitely not garbage.
74% - 0% - Still listenable as well as being stinky garbage. A 75% is the lowest score I'd be willing to give for a review. So in saying this, I don't find it necessary to review anything I absolutely hate / loathe or that I think is somewhat a complete waste of time or that I disagree with, which would be something that falls under a 75%. Even though I probably still listen to and enjoy such material.