Just 3 from me.
I'm a small U2 fan, and believe they have their moments, but seriously, "How To Dismantle an Atmoic Bomb" . . . . good lord. It was a huge step backwards for them. Have a look at a review I read. I think it's true as true can be:
http://www.thebestpageintheuniverse.net/c.cgi?u=11worst
And the other huge disappointment to me was "By The Way" from The Red Hot Chilli Peppers. No specific complaint here, I just thought it was crappy.
And last, but not least, "Riot Act" By Pearl Jam. They can do so much better. No further comment.