But DE, not all "stiffs" are bad. You are making it sound that way and essentially assuming that they are, just because classic hits radio supposedly labeled them so.
Let me acquaint you with a term of the trade: "stiffed out".
A song may start positive as a new release. It may even have its moment of chart fame. But at some point, listeners don't want to hear it any more and music buyers don't want to buy it, either. That's when we say a song has stiffed out.
It may take a few months for a song to stiff out. It may take years or decades.
But all stiffs are bad because they have developed dislike and rejection. They are negatives, and they drive listeners away.