Most of the the stuff on Beatport etc is much newer stuff though I really can't blame those records on Mastering (apart from my own at the time) or pressing.
There basically a definitive example of over compression to the point of destroying dynamics as pointed out by someone in another thread certainly C-Side 2,3,3,5,6 and the Stimulus releases I made around the same time suffer badly from it Im rather embarrassed to admit, It's not something I did deliberately just the unfortunate result of learning your trade whilst making records.