Like lots of the people that have poted here, I'm a newbie, and a newer Maiden worshipper (well, I should say H and Murray...
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I don't have all their albums, but I do have my likes and dislikes. Starting w/the Paul albums, I like just about evry song except Prodigal Son cuz it's long and drawn out, and they never played it live.
NOB is outstanding! But to many people it's only 3 songs: NOB, Run To the Hills, and Hallowed Be Thy Name. They could be overrated, I guess...I dunno
From POM-7th Son I just love all of them. Although Can I Paly w/Madness can get a bit annoying after hearing it a few too many times in a row.
I don't have NP or FOTD or the Blaze albums, so I can't judge those. Well, I take that back, I have Best Of the Beast and the Blaze songs on there are good. None I feel are overrated
Then the "reunion"...
BNW is a masterpiece! It grew on me after listening it the album in its entirety about 10 times over a month or so...
DOD is great too, but a few songs I don't care for...Montsegur, Age Of Innocence...they don't do anything for me. It's one song...Paschendale. Best song ever
AMOLAD is terrific!
So in the end the most overrated song to me is...Run To the Hills.