When we are introduced to werewolves with Lupin he doesn't seem to have any special characteristic while in human form. We can presume, since is canon information, that any wound he inflicts will leave lasting scars, but not much more.
Yet we meet Fenrir Greyback who, while in human form, shows some arguably superhuman feats:
- Animal appearance
- Described as "a grey blur" when running
- Some resistance to the Stunning Spell (in Malfoy Mannor)
Even more, he plans to build a Werewolf Army to take on the wizarding world, which admittedly can be composed mostly of discriminated wizards with no special abilities but it seems unlikely to harbor that thought with such an inferior force (unless werewolves are really powerful).
So my question is: are werewolves in a human form stronger/faster/sturdier than other wizards? If not, are the features we see in Greyback superhuman? Is Greyback the only werewolf with a super-powered human form?