The production on both Bonded By Blood and Fabulous Disaster from Exodus. Both albums have nice ass riffs and solos, and are both very thrashy, yet you have to turn the volume all the way up just to hear the albums well enough. That pisses me off.
I find this is true for most Sabbath albums, also. Namely Paranoid.
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I also hate it when a song ends, and it's just 40 seconds of near-silence, or high-pitch guitar feedback. Either cut the irrelevant part of the song, or mix it onto the next song so as not to draw things out longer than need be.