The Nordic dead are unusual for anything but the most well preserved undead, or artificial constructs like Bonewalkers and Flesh Atronachs. The fact that they're so well preserved and retain some level of cognition and skill they had in life make them a huge cut above their peers.
Most zombies would probably end up falling into the rotting, shambling horrors you see in Oblivion. Most necromancer's might not exactly be skilled, and so their fodder continue to rot and move sluggishly. Now, having no sense of self-preservation and taking a lot of critical punishment like limb dismemberment is cool, and something we know applies to TES. Headless Zombies anyone?
I'd say that Draugr and Bonewalkers are the "TES Zombies" personally. Feral Ghouls I'd call the Fallout series version of zombies... And... Centaurs to a lesser extent perhaps.
Edit: Actually I'd say Centaurs are more like the Fallout's Frankenstein esque Flesh Atronach... Looking like a frightening amalgam of different things.
Ghouls from the Fallout video games are not undead are they? They are human beings that are alive and their brains are destroyed or rotting because of the radiation from the nuclear bombs that exploded. At least I keep reading this in the Fallout lore. Am I reading something wrong here?
No, you're not. But they still fill the obvious zombie niche never the less. Well, Fallout 4 especially, given that losing their limbs save the head doesn't really put them down like the normal ghouls.
Fallout has absolutely no undead characters afaik... If anything is Supernatural about the Fallout series, then it's certainly not undead characters at all- at least afaik. That said, Feral Ghouls simply ACT like zombies, and LOOK like corpses... Hence the zombie comparisons. Afaik the word "ghoul" has very undead connotations if not explicit meaning, and they are probably called Ghouls because of looking Undead even without being Undead.
The "lazy or desperate" ones may not. http://www.uesp.net/wiki/Lore:Corpse_Preparation_v_IIIexplains how necromancers can raise mummies in spite of rigor mortis and desiccation and why they're more useful than zombies.
I think what may be going on really is... Fallout 4 just has really really good animations- and it makes Feral Ghouls very creepy in Fallout 4... But I trust TES 6 will have significantly better animations than Skyrim, and that they won't need to just copy Fallout 4s animations to do it. Yes Feral Ghouls are extremely zombie like, and yes they make a great replacement for zombies in Fallout... That all said in TES I prefer, Bonewalkers, and Draugr much much more than Feral Ghouls.
Also Feral Ghouls fit the niche of... Pseudo-Undead or Pseudo-Zombie- as in not TRULY being Undead... Unlike say tes zombies that are actually Undead.