And they were badass enough to earn Ner'zhul's admiration, which means: yes, very badass. It's possible they see Anub like humans see Arthas, though: although it doesn't make SENSE that he apparently went shithouse crazy overnight, he's definitely still in your base killing your dudes and that makes people angry.

...I'm actually also a little sad that they changed the Forsaken architecture away from the old Lordaearean models. It always made more sense to mean that dead humans would still build like they always did. The Dr. Frankenstein apothecary stuff is cool too but... All of my Lordaeron nostalgia. Let me show you it.