What made Morrowind unique for YOU?

After a decade of pursuing good-ish RPGs in this world, I am finally back to Morrowind and I am dying to ask this question: what made Morrowind unique to you? Was it the setting? Character creation? Story? Share your tales with yours truly, I am patiently waiting to hear what is it about this game that makes it so memorable and immersive? The more Morrowind tales, the better!