Killer guitar work on that tune, lousy album cover !
I'm a big fan of re-masters. Most of the hardcore bands had no $ and it affected the final product, so with the advancement of technology I'm all for bands going back and making it sound like they intended it to.
Re-recordings I'm not big on, although a lot of the Destruction, Exodus and Testament re-recordings were note for note true to the original and much more brutal. So big thumbs up !
The Bathory albums are kind of low-fi, perhaps Quorthon wanted it that way, as I do believe he had the first black metal albums with his first 3 releases. The Return...being a great black metal album, way back in '85. But some of his power stuff from that album and Hammerheart would just be much more crushing with a good-remaster, since that's the only option (RIP).