Why do people link "Crazy and Alien" with originality? Every damn time. I'm not asking for giant mushrooms, or people who live in giant dead crabs. I'm asking for ORIGINALITY. Learn the word. Horkers, for example. They were pretty original. Not alien. Warcraft's Tauren. They seemed original. Not alien.
I think the better question is why you don't expect people to think "crazy and alien" when you suggest TES games have "original" creatures like Morrowind, whose creatures were all crazy and alien.
Regardless, Morrowind's gimmick was pretty much stranger-in-a-strange-land. None of the other Elder Scrolls games do that.
Listening to half the things that are announced for Skyrim and interviews with Todd Howard will let you know that they are fully aware of the typical TES fan and their views on Morrowind. They've already said they see a lot of what Oblivion lost from Morrowind and things like that, as well as explaining why they don't just make Morrowind 2 or something similar.
And yes, it does come off as bashing Oblivion when Morrowind is the odd one out and Oblivion is following suit from the rest of the series.