I disagree. Bleach was and still is superior than Nevermind, but its on the same factor In Utero. Though the MTV Unplugged is the best they have ever done, recording wise.
While I'll defend my statement that Dance of Death is the best Maiden album, its the only Maiden album that I have enjoyed every song. Powerslave really goes down after 2 Minutes to Midnight, and there aren't any hidden gems that Maiden comes out and grasps.
The X-Factor is bad. Horrible. Save for Sign of the Cross, which Bruce does better on Rock in Rio, its dull and boring.
For System of a Down, no doubt in my mind that their self-titled would stand out. Production is too muddy? bah. It was something new and good to the metal scene at the time. Though Mezmorize is better than Toxicity, any of these albums were better signifigantly than Steal this Album!