There's a method to the black metal madness
The "sounding like shit" is purposely used to create atmosphere, texture, and ambience, in a myriad of different ways.
Emperor, Ulver, and Mayhem use it on their early albums to create a huge, cathedral like vibe, like you're listening to the band play inside a castle or gothic cathedral.
Burzum and Darkthrone used analog tape compression to "smear" everything and create the sense of a dreamlike haze for the former, and the dirt and smoke of a pagan ritual for the latter.
Enslaved, Windir, and Immortal used the treble fidelity and ice-pickiness of early digital recording to create an icy, winter storm atmosphere with incredible depth of field
They may objectively "sound like shit" but they are all doing it on purpose to create atmosphere and vibe, and they do it better than 99.99999% of death metal bands - the only bands I can think of that used their production as a weapon like that (in various ways) are Morbid Angel, Carcass, and Obituary
Unfortunately, CC sounded a lot more interesting to me when they sounded like their own band