People who like Belus: listen solely to early Black Metal, perhaps even only first wave bands;
People who don't like Belus: listen to some or a lot of "new Black Metal", or have listened to it in the past.
So Vikernes stumbles across a good thing on Filosofem, with Jesus Dod. Then later bands like Drudkh or whatever (I don't really know this, I'm just assuming) decide to use the same kinds of techniques to create their own atmospheres, but they're "Pagan Metal" instead, so they don't make it as "evil" as Burzum was. Then, a decade or so after people start overdoing Filosofem, Vikernes gets out of jail, and records a load of songs that he wrote more than fifteen years beforehand, arranging them in a "Filosofem meets Hvis Lyset Tar Oss" manner (as described by himself), with a Pagan twist given the concept of the album, which combination, from the perspective of someone who doesn't listen to new Black Metal, is interesting, even surprising, at times, and definitely "extremely good". To someone who's spent far too much time listening to crappy modern "Black Metal", the album sounds tired and repetitive, since, over a huge number of bands, and an even greater number of songs, they've heard it all before.
This begs the question (again): why do people not look at the context?