A lot of people are listing Another Time Another Place for Boy, and I'd agree with that. Way cool song.
Fire, despite being a single, is not a song I see a lot of people talk about, when really I think it's one of the best songs from October.
I don't think The Refugee is a great song, but it's not nearly as bad as a lot of people make it out to be, so I'd say that's probably the most underrated song from War.
Indian Summer Sky has always been one of my favourites from UF, but no one ever talks about it. It's not that it's hated; it's simply overlooked.
Trip Through Your Wires is xtremely underrated. I don't know why everyone hates this song. I've always liked it. It's got the sorta bluesy feel that some of the R&H stuff has. Also, I think the studio version of Bullet is often overlooked for the admittingly superior ZooTV version. It may not be as good as the live versions, but Bullet is still a great song, even on the album.
Heartland is NOT underrated, not around here anyway. To the general public, possibly yea. Really, I don't know what is underrated from Rattle and Hum. I guess I underrate the entire album 'cause I don't listen to it much
Van Dieman's Land is nice, and When Love Comes to Town is better than people give it credit for. Just the fact that U2 did a song with B.B. King is way cool.
From the perspective of the masses (and the band itself?), Acrobat is clearly underrated. However, I don't think much of anything from Achtung is underrated here. Maybe Tryin', but it seems the majority of fans here like it. One, though held to pretty high standards among critics and Rolling Stone lists, has garnered a lot of hate around here, I think mostly from overexposure. But it's really a fantastic song.
I'd say the general public doesn't even know Zooropa exists, but here I'd say the underrated song is Babyface, or maybe Daddy's Gonna Pay. The Wanderer, too.
Pop is underrated by everyone ever. No, really, probably the most underrated songs are Miami and The Playboy Mansion. They frequently make people's least favourite song lists, when really I think they are in U2's top 50.
ATYCLB is underrated here as a whole, particularly Stuck and New York. New York is one of the best songs on the album, yet most people here hate it. WIALTW seems to get a lot of praise here, so I wouldn't really call it underrated.
HTDAAB...I'm gonna say A Man and a Woman. Again, I think it's one of the album's better songs despite the fact that the majority seem to detest it. I don't think Vertigo gets nearly enough praise either. The energy in that song is amazing.