These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Base: The release of the 2011 re-recording of 'Under the Sign of Hell' has been polarized as well: Most fans despise the album due to removing the atmosphere of the original, while others feel it's decent.
Grim (real name Erik Brødreskift) also has a surprising amount of popularity for being in the band for such a short time (likely due to Dead Artists Are Better) and also being the inspiration for the Hole in the Sky festival.
Epic Riff: "A World to Win" and the title track from Incipit Satan, "Sorg" from Antichrist, "Profetens Apenbaring" from Under the Sign of Hell, and "Of Ice and Movement" from Twilight of the Idols are standout examples.
Face of the Band: Infernus. Gaahl might also qualify amongst the general public.
Nightmare Fuel: Gaahl himself is just downright scary. Coming out of the closet didn't make him appear any less so.
The Scrappy: King ov Hell is NOT well-liked by fans, especially after he and Gaahl tried to wrest the band from Infernus. To give you an example, look at Darkthrone's Circle the Wagons, and you'll see the catalog number "ANTI-KING OV HELL 001" in the album notes.