Rattle and Hum is full of classics, I've always loved that album, but I don't like the movie much. It's the album that gave us the original Desire, Angel of Harlem and All I want is you, all classic and great U2 songs that are still standard repertoire at live shows today. For me, the album suffers a bit from the gap between the live and the studio tracks and there are some weak and filler songs on it, it's simply too long, IMO.
Pop has grown much on me, I love the album as a whole, Staring at the sun and Please are among my favourite U2 songs, but I could never get myself to like the tour or the band's image at that time. Even the PopMart DVD couldn't change that, it's simply not "my thing".
October is underappreciated as an album, Tomorrow is one U2 song that never fails to touch me. All in all, it's the U2 album I hardly listen to. But thinking about it makes me want to go back and listen to it again.