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.
Yong Montaño's work as seen in Giant-Size Werewolf #4 and #5, especially in the black and white reprints. It remains realistic despite the fantastical setting. His people look like people — it feels like you could run into them on the street.
Leonardo Manco, who did all the art for volume 2. His style is dark and gritty, and is not afraid to use textures and wild brushstrokes, which fits very well with the state of mind Jack's in.
Bizarro Episode: The fifth Giant-Size Werewolf starts like any other story, with Jack figthing a Satan-worshipping sorcerer. But then he is suddenly pulled into a bizarre fantasy world for one seriously trippy adventure.
Captain Obvious: Meta example with the book's title. When else would you expect to see a werewolf?
Complete Monster: Belaric Marcosa was a shockingly dark villain for even a 70s Bronze Age Marvel horror series. In life, Marcosa was an evil aristocrat who lured victims to his manor to use dark sorcery to drive them into 'lewd depravity' before he sucked their lives and souls out before having them murder one another for his amusement. He then kept their souls trapped in his manor. After his death, Marcosa had more victims lured to the manor so he could torture them as well, playing dark mind games and driving his victims to distrust and murder one another before revealing himself and attempting to add their souls to his collection.
This fits well with his status as a Captain Ersatz of Emeric Belasco, the equally depraved villain of the classic horror novel Hell House.
Narm: Despite being a powerful villain, Dr. Glitternight is hard to take seriously due to his wingsuit-like robes, which makes him look like a flying squirrel crossed with Sinestro. And then there's the name.
The entirity of volume 1 has been reprinted as part of the Marvel Essentials line. These omnibuses are in black and white, and as such do not have the spotty, flat, and undetailed coloring of the 1970s. This gives the expressive and detailed linework, most notablity that of Mike Ploog and Yong Montaño, the chance to truly shine.
Some re-released comics, such as WbN v1 #25 reprinted in Moon Knight v3 #30, are recolored digitally, in gaudy colors that appear to be chosen randomly: magenta skies, purple blood, blue palm trees and walls that change from purple to red to grey in a single page are everywhere.
The Woobie: Jack. Especially in volume 2 you can't help but feel sorry for him. "Top of the world, ma."