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.
Anvilicious: So you may be wondering why the trope name is in bold. Well, because they write very straight-to-the-point lyrics, probably the most greenhouse lyrics in all of metal, on par with a French tech-death band.
Love It or Hate It - As with all grindcore, really, but Napalm Death are the most visible band of the genre, so they get more focus than the others.
Magnum Opus: From Enslavement to Obliteration, to the point it gave the name to an actual music label based on extreme metal.
Scum is another contender, and is definitely the album most commonly associated with the band.
Harmony Corruption is generally considered to be the best of their deathgrind albums, and along with albums by Repulsion, Carcass and Terrorizer helped shape the the more metallic grindcore sound.
Signature Song: "You Suffer (But Why)," if only because it's The Guinness World Record holder for shortest song. "Scum" is probably their most well known song and is probably what most fans of the band think when they hear someone mention Napalm Death or even grindcore in general.
They Changed It, Now It Sucks: While the Napalm Death fanbase is divided into people who prefer their more hardcore leaning grind albums, people who prefer their more metal albums, and people who like both eras, neither of them had a positive reaction to their more Industrial/Groove Metal-tinged late 90s albums starting with Diatribes.