The definition of a "crappy fly" is easy. It is a fly that is pooly tied, poorly proportioned, overly bulky, falls apart quickly, tied on very poor quality hook, tied on the wrong style of hook for the style of fly, tied with poor quality materials, overly large head, etc.
My definition of "classy flies": beautifully tied spey, dee, and classic featherwing salmon flies (topping wing, married wing and strip wing) that are very effective fish catchers, which also make very nice artwork when tied and placed into a frame (I'm aware that I left out saltwater, trout, bass, pike flies in this illustration). In other words, the flies that require a high degree of tying skill and the use of high quaoity materials which are proportioned properly are "classy flies", everything else doesn't measure up
By my defintion, a "classy fly" is one that no one would be embarrassed to put in a frame and place on the wall of his living room for all to see. Yes, this definition leaves out flies like the gold ribbed hare's ear, grey hackle, brown hackle, girffith's gnat, grease liner, wooley bugger, most chenile bodied flies, and other flies that are usually taught in beginner fly tying classes. Because even if they catch fish, they are still fairly ugly and take very little skill to tie.
I am curious why a simple grey hackle style pink fly though because I have never found spring creek trout to be fond of things other than pretty close color and from matches. I also have never found northern pike or pickerel to be fond of anything but large streamer style flies in colors other than pink, and I have not found smallmouth or largemouth bass to be fond of small or pink flies either.