The fillerslave trope is pretty silly and seems to reinforce the idea that popular opinion is sometimes shaped by the band's live activities in positive and negative ways. Powerslave is an excellent album and probably the band's most consistent. It tends to be the one I recommend the most to new fans. It's a great starting point. You really enjoy Aces High and Two Minutes to Midnight? Great, work your way backwards and check out Piece of Mind next. The prog and instrumental intricacies of Rime of the Ancient Mariner and Flash Of the Blade blew your mind? Somewhere in Time next.
It is true that the album is bookended by some of the band's most renown tracks and other albums aren't quite structured that way, but the material in the middle has a lot to offer. Flash Of the Blade is an amazing song. Love the guitar harmonies and I would have liked to hear this song played by the current lineup. The Duellists and Back In the Village have some flaws but are overall enjoyable. Losfer Words is probably my favorite Maiden instrumental. Dare I say underrated.
That being said, it's obvious to me which songs deserve promotion. Rime, Powerslave, and Two Minutes are the 10/10 songs on the album and are all top ten worthy. 2 Minutes is probably the pinnacle of Maiden rockers. Great riffing, awesome chorus, love the halftime breakdowns, two fantastic guitar solos, excellent lyrics from Bruce. It's all there. Not much has to be said about Rime or Powerslave.