I've seen some magazine articles lately suggesting that I, and the bulk of consumers, can't, but they don't offer any help on how to improve myself. I admit that I don't have much of an eye, but I'm willing to do my part to keep from drowning under a pile of crap. Barney Dear P.B., Your question is a can of worms. No magazine has answered your question simply because there is no answer.
Quality is immutable.
At the moment of its completion, an object's quality is unchangeable. Excepting philosophy, ideas are without quality. Crap is not antipodal to quality. Crap seems to me, in this case, to add that splash of the subjective. I would dump JP Todd driving moccasins in this category.