My friend and I were discussing U2 - a band that we both enjoy and criticize - and we were trying to dissect their post Joshua Tree catelogue (since its after that album that U2 really changed into its modern form). Here's what we came up with.
Achtung Baby is a stunning album, and one that, if I were forced to, I would pick over The Joshua Tree. It's a perfect balance of three different things: sonic experimentalism, rock posturing, and the band's honest songwriting. Those things don't sound like they should go together, but somehow it worked. The album sounds like its about to fall apart at any second, but never does.
But it seems that Bono and co. were unable to decide what to do next, because each of their next three albums took one part of that balance and took it to an uncomfortable extreme. Zooropa was an admirable but failed attempt to make an experimental album, Pop, their worst album, was nothing but empty techno posturing, and All That You Can't Leave Behind was honest songwriting that outside of a couple of songs was nothing but boring.
How to Dismantle an Atomic Bomb is the band's best album since Achtung Baby, but its a troubling one. It works because it finally brings these three different sides of U2 back together into one album. It fails because it ends up like a vastly inferior sound-alike to Achtung Baby. So the band finds themselves at a troubling spot, unable to live up to their two best albums.
Should they call it quits? I'd like to think they can still surprise, but with their last two albums coming off as pale impersonations of the past, I don't have my hopes up.