Let me add my voice to the (half-hearted) defense of Armageddon - it's not a good movie by any means, but it's nowhere near as bad as some of the other films on the list. It's stupid, yeah, very, very stupid, but stupid can be fun, and Armageddon is fun.
I note that you didn't list Independence Day in group B, which suffers all the flaws you list with Armageddon but also takes itself way more seriously and I found far more difficult to watch. Armageddon is fluff, it knows that it's fluff, and never tries to be anything other than (very expensive) fluff.
Compare that to Batman & Robin (which fails at being fluff) or Battlefield Earth (which fails to realize it is fluff). I don't think Armageddon is anywhere near those two in the level of its badness.