Wow! I finally caught up to the end of this thread.
My 2 cents: U2 is popular with those who grew up listening to them during their teens/young adulthood and that is normal. Today's younger generation think they are senior citizens and the real senior citizens grew up on Beatles, Stones and Doors, not U2.
Personally I never cared much for U2. Every generation has their popular bands, but when you mature yet remain emotionally attached to a group that you grew up with, you fail to keep an open mind about how good or bad the music might be. I grew up listening to the Beatles, but today I can't stand to listen to most of their stuff because it isn't the kind of music that stands the test of time. There are a few worthy pieces but in general mostly pop junk.
Today, most of the music I like is by bands/singer song writers that I have never heard of before.
Well, that's not really the general opinion about the beatles (public and critics), except maybe their 1963-1964 output. They still sell pretty well. Most actually stands the test of time pretty well, it actually sounds a lot more like current Indie Rock than current Pop
U2 had very good output in the 1980s early 1990s, I'd say 50% has stood the test of time, while the rest sounds dated. But, no more dated than early 2000 output from the likes of Coldplay or Radiohead (in my opinion).
Guitar rock in general is a lot less popular than before and that's why U2 try to go into more EDM type music. Not sure they succeeded, but at least they tried unlike the Stones who have not had an original thought since the 1970s (and are still selling stadiums). Not many bands from 1980 are still around and somewhat relevant.