*gasp*
Chugging? On "Om?" You can't use Negurã Bunget and such negativity in the same sentence man! You must look beyond the surface to understand this band. They are entirely unconventional, even for Black Metal (which serves as their core foundation only, not as their primary vehicle for expression). This band is beyond the boundaries of Black Metal, they have expanded from it in ways that most other bands can only contemplate on.
Om is a masterpiece of an album, unlike anything else out there. Negurã Bunget is Black Metal of its own kind, you cannot compare it to anything else, it is wholly unique and stands entirely on it's own merits.
Their later works are the ones which show their true potential, their true expression in parallel and in perfect harmony with their spirituality. The earlier works do not truly express their beliefs in the ways that N Crugu Bradului and Om do.
I highly recommend you listen to Om again, Crimson. It's a remarkable album, but more importantly, a highly conceptualised spiritual document.