Pedigree is irrelevant if the results stink.  The production on The X Factor, Virtual XI, Dance Of Death, and The Final Frontier is inexcusable for an A-list band.  AMOLAD and The Book Of Souls are passable.  Brave New World is the only album from the post-Birch era that actually sounds consistently good, and even that one has some issues with the vocal harmonies.
I don’t understand the point of fanboyism on this.  The “whining” may amuse you, but the results on the albums are obvious disappointments unless you like a sloppy, muddy, raw sound.