Quality

This point will be controversial. The word "quality," in my estimation, is first of all a noun and second, a generic word that doesn't express positives (or negatives). Merriam Webster's Collegiate Dictionary, tenth edition, allows for "merchandise of quality" to suggest the merchandise is of good quality. Also listed therein is "quality" as an adjective meaning high quality. To me, that's like allowing "number" to mean high number. Keep in mind that dictionaries, to some degree, follow the crowd; that is, they permit usage that has become common, whether right or wrong. For me, "The merchandise is of good quality," is the way to go, not "The merchandise is of quality," or "This is quality merchandise."