frankly all things considered, I think the impact, the change, the sound, the songs, the lyrics, the guitar, bass and drums. A record made out of desperation almost, it really is the best album I have ever heard, but to compare it to say the Joshua Tree, which AB & JT are the consensus top 2 labums my U2, so comparing it to the Joshua Tree it was more ballsy, more of a departure, it also represented a record that stood up to its counterparts not only REM but Nirvana and newer bands. Joshua Tree was up against Bon Jovi, not to make JT less of an album but it had less impact on the actual sound of contemporary rock music. Now I won't even compare AB to ATYCLB, ATYCLB is a pop album by a bunch of 40 year old rock stars, and IT IS GOOD, but its not in the same solar system as AB or JT, or even Pop in my mind. I like artists who push the envelope, which U2 did for the better part of 20 years, to me they are in a different phase of their lives, musical and personal, they are in a position where pushing the envelope is not in their best interest but to make the best record they can make and be relevant, not necessary sell alot of records but BE relevant. I think if you look at the measure of the bands 21 or so years together they have many highs and lows and great records and very good records and a few average records. But in 25 years when U2 are no longer in the conscience of popular music at all, they will be a historical landmark and most people will look back and say The Joshua tree was their big seller, a great album with alot of hits, and Achtung Baby will be the one that reminds people that this band is more than the sum of its parts, more than just a rock band, but a band that can change its image and sound completely different and still be brilliant, they risked alienating an audience that was massive, they risked commercial failure with the ensuing tour, we'll all look back 25 years from now or so and say it might possibly be what I truly think it is now, the greatest rock and roll album ever made for all of the above.