Each album sounds different, "Blaze In The Northern Sky" still has some of their early death metal influence, but with a much blacker style and "Under A Funeral Moon" is heavily Bathory influenced. Whereas, "Panzerfaust" had elements of Celtic Frost.
Try to avoid "Goatlord" or "Soulside Journey" when your first starting off, because those aren't really an accurate reflection of how good Darkthrone are. This is similar with "Total Death", it's not the best album they've released....
My advice is to start with "Blaze" and work your way in order towards "Plagueweilder". Then you'll get to see how the band have developed.
As for production, does that really matter? If you've got amazing music then that will always win hands down, just look at Emperor's "In The Nightside Eclipse"....