In Morrowind, there were Imperial Legion forts that were well-maintained and populated by the Imperial Legion. In Skyrim, the Legion's forts are stuffed full of bandits and clearly about to fall down. The roads were shitty or nonexistent. In Oblivion, in the heartland of the empire, the forts were crumbling and populated with marauders.
I guess all the legion troops and the engineering teams are still figuring out how to get off the island they were on in Morrowind.
@Doephin Yeah, that's kind of the big kicker. The Oblivion forts _should_ have been properly built up and maintained and just... under Daedric siege. Wandering around in Oblivion, I kept wondering where the actual civilization was... everything was frontier.
@Soreth There's a pretty hefty time jump between Oblivion and Skyrim during which the Empire is Having a Bad Day.
no excuse for the Oblivion forts though.