I respect, but do not love, the artistic decisions they made with Zooropa and Pop.
Since Pop, they've reverted to a cookie-cutter mega stadium act. Their albums contribute nothing that they themselves haven't already contributed. Their theme material is superficial, rehashed, or sometimes nonexistent.
Meanwhile, they continue playing shows with $250 top ticket prices under 360 deals with Live Nation, the Gordon Gekko's of the entertainment industry.
I don't think U2 is evil. I just don't think they're anything more authentic or credible than, say, a Jerry Bruckheimer movie.
Man, that's cold.
Also there's that business of Bono sheltering his own money offshore while campaigning for more aid spending from taxpayers.
Except that occasionally things which are much better then average become popular without comprising their art, and then people still think popular == crap, even when it's not.