People go on about the low quality production of bands like Darkthrone and other black metal bands, but the worst I've heard is Fimbulwinter. The vocals are almost inaudible, the bass is almost inaudible (not unusual for bm bands though), and at times the guitar can be just a constant noise. Despit this, it's still my favourite black metal album.
Fimbulwinter - Servants of Sorcery