FitzChivalry said:
How To Dismantle An Atomic Bomb -- One Step Closer (beautiful and powerful and I don't know why it's get lambasted so much on here )
YES. It's one of the few HTDAAB songs I still find listenable.
As for my own list ... well, since we're not clear on what's meant exactly for under-rated, I'll go with something similar to you: "under-rated live by the band, i.e. the band under-rated its power and tossed out the song way too early".
Boy: Twilight (No performances seince 1984? Come on!)
October: Tomorrow (I just can't believe a song as strong as this has not been played since mid-1983.)
War: Seconds (Seems totally forgotten; I think it'd fit comfortably into any set from the 2000s.)
The Unforgettable Fire: Indian Summer Sky (Just nine performances? I think this one really owned.)
The Joshua Tree: Exit (One of U2's strongest live songs, and it's only been done once since 1987? Insane.)
Rattle And Hum: Heartland (When the live performances of possibly the best song in your catalogue consist of just two snippets, you know something's wrong.)
Achtung Baby: Acrobat (Do I even need to explain?)
Zooropa: Dirty Day (Hey, U2, ten performances are not enough.)
Pop: Last Night On Earth (Leaving this to the past of Popmart is criminal.)
ATYCLB: When I Look At The World (Best song on the album and it's been snippeted - not even played in full - merely once? Incomprehensible.)
HTDAAB: Crumbs From Your Table (I wish they'd spent more time ironing this one out as it deserved a live career far more than crap like SYCMIOYO.)