I have to agree with you. U2's output is not near as substantive as say, Pink Floyd, or the classic Stones.
Bono's voice (and persona) started overwhelming the band about the time of Joshua Tree. I still like the first two albums best.
But they do have a helluva rhythm section. One of the best around today.
I don't get down on Bono for trying to save the world. But the best story I heard about U2 was how they were investing their money in a bowling alley in some place in Germany only to find out that bowling wasn't allowed in that town.
But it's hard to play preacher-man without getting too sanctimonious. Funny how Jesus managed to do it, but how so many that speak in his name are unable to . . . .