Disco at its best had good songs at its core—eg, early to mid 70s. As the decade went on it went less with actual songs and more with “dance tracks”. I keep thinking about that 60 Minutes segment where some producer is mixing some really boring track that didn’t sound like it had melody, verses, choruses, etc.

I guess dance tracks have a function for getting people out on the floor, but you don't really want to listen to them in your living room.