I also loved Belus. Fantastic album. I only learned it was out recently and hadn't heard any of the pre-release chatter, so I didn't know what to expect. Would it be more industrial? Less metal/guitar based? More ambient? Regardless, I assumed it would be an abomination of a record. I figured if it was metal it would feel like a shallow, soulless cash-grab, and if it was true to Varg's artistic vision it would be based in some tedious electro-ambient-noise genre I didn't care about.
For me, Burzum peaked at Hvis Lyset Tar Oss. Filosofem was too industrial (vocals ruined it), and though I appreciated Daudi Balders and Hlidskjalf I didn't really enjoy them. So I was pretty shocked to find that Belus picks up right where Hvis Lyset Tar Oss left off. Catchy riffs, compelling atmospheres, hypnotic song structures that don't become tedious, and the best vocals on any Burzum record. It might not be revolutionary in terms of the genre, but it's a damn good record. It's also by far the most consistent Burzum album. It maintains a sense of wholeness rarely captured in his recent releases and sorely absent from his older material. I listen to it as an album rather than a collection of songs, which is something I rarely care to do with other Burzum CDs. Biggest musical surprise of the decade for me.