I said this earlier at some point during this survivor, but I'm not happy that all of the top 10 are from the band's first four albums. Is it surprising? Not at all. But their later albums (excluding St. Anger, of course) have some amazing, well-written material on there that, in my opinion, had a lot more heart put into it than the likes of Battery or Creeping Death.
As for Kill 'Em All, don't even get me started. I don't think there's one song on that entire album that would've made my top 20. Or top 30, or probably even top 40.