The Saturday Night Fever soundtrack is better than most music produced in recent years. Many disco songs were actually very good funk or R&B
I did not see that movie until the early 1990s due to peer pressure. It was actually a very good film.
SOME disco was very good although the BeeGees produced very little of value. And I agree - even with an open mind, virtually every piece of popular music of this century has been garbage. I might hear maybe one or two songs a year that is worth listening to.
Much of the disco music that aired on Top 40 radio was pretty unimpressive compared to what aired on the dance floors or disco stations. There was material out of Europe, and subgenres like “space disco”, that made the Bee Gees or K.C. and the Sunshine Band look positively pathetic.
And yes, hardly anything worth a listen, much less keeping, out of this century’s music. I’ve had to go with “alternative” music (Arcade Fire, The Killers, etc.) or Postmodern Jukebox to find anything good.