Can we have less biased polls?
^
Every single thing you said about Oblivion is just straight up wrong. Mankar Camoran had a motive. He was misguided in his efforts, but he thought what he was doing was fair and just. Cyrodiil is not a "blank, happy empire." It's the exact opposite. The Emperor is murdered, Martin becomes unavailable, and the Empire is in decline. It's not blank and it's certainly not happy. And NONE of the quest lines had "same old villain stuff." That idea is completely ridiculous. Mankar Camoran and Mannimarco are the only two NPCs in the game I could count as "villains," both of which there's more to than just that.
Try looking into Oblivion for five seconds instead of getting married to Morrowind.
Also, Jyggalag had a motive too. He was reclaiming his realm.
EDIT: Since you changed the options, I'll answer. Keep in mind I've barely played any Daggerfall, so I won't be including it in my responses.
I like Dagoth Ur the best. He's one of the most interesting villains in history in my opinion.
Cyrodiil had the best political system. Morrowind had a bunch of racism and in-fighting and no one could get along with anyone. Cyrodiil had its own problems, but it was controlled yet interesting. Just wish the Empire would get out of the other provinces and keep to themselves in Cyrodiil.
I want Skyrim to be its own game. Arena is different from Daggerfall is different from Morrowind is different from Oblivion. Let Skyrim be different too, don't hold it up to some other game and expect the province of Skyrim to be like the province of Morrowind or Cyrodiil. It's different. Let it stay that way.