It's hit and miss though, for me.
Sometimes that B-side, (like Smile) has enough character and charm to be worth noting, maybe even worth a slot on the 'second side'. Sometimes like (Are You Gonna Wait Forever?) they made the exact right decision.
So, it's certainly subjective.
It seems with U2 (since POP) that the length of studio time, spinning the wheels, hurts the songs more than anything. Take 'Smile' again. If they had spent more time on it, it could have gone either way. It could have lost it's charm or it coud have been a killer single.
I generally prefer the more raw U2, not in the sense of sloppy playing meaning raw, or harsh sonics being raw, but raw as in, capturing the band at their greatest and most creative, even if it's not the most polished it could be.
After all, most of the people who like the shiny polished songs are often only concerned with the 'single' type material anyways. Who really needs a song like Exit or Acrobat to be pristine studio versions, with perfect songwriting chops and sonic textures? Leave in some of the raw, U2, please.