Oh, so a floating city from Oblivion (there's something you don't see every day) invaded Tamriel 160 years ago and turned everyone into zombies? Nope, nobody cares, they're still busy talking about Martin Septim. Clavicus Vile especially doesn't care.
So the new Empire is ruled by the Mede Dynasty? Nope, the Dark Brotherhood killed him. Gotta come up someone new.
Remember all those cool new Daedra? Like the scorpion/hornet/spider that Sul summoned? What about Hobs? Nope, all we get are Atronachs.
Hell, remember Jyggalag? Not a guy from the novel, sure, but what the hell happened to him?
Pretty much the only thing that stuck was the Thalmor.