mate IMO their old records sound like they were recorded in a tin can.
As I said the playing on DM is way more superior ....plus heavier
DM is not heavier than their earlier albums - it just isn't. It's heavier than the black album and everything since.
As for the playing being superior - it may sound that way to you but as a guitarist (and pretty sh*t one at that) I will have to disagree. Justice would be their most technical album by far.