Azas
Endless Summer
There's nothing wrong with Invaders or Gangland. Call me crazy but I like Chains of Misery. It even could have been played on American radio if the band name wasn't Iron Maiden IMO.
I agree that Invaders and Gangland are passable songs. But judging them against Iron Maiden's classic hits doesn't do them any favors.
As for the more experimental songs on Fear of the Dark, I strongly disagree. To my ears, those tracks are very un-Maiden. They sound like the band trying to be something they never really were.
Regarding Virtual XI, I personally rate only three songs as very good to great: Futureal, The Clansman, and The Angel and the Gambler (the short version). Beyond those, the album comes across to me as rather whiny and depressive. That's simply how I hear it. Sorry.
As for Quest for Fire, yes, the lyrics are questionable, but I think the music is good. So in my previous post, the songs from the '80s were simply the usual suspects—the tracks that aren't particularly loved by a large portion of the fanbase.