Im not sure I understand how they "improved" from Oblivion. My own opnion has been varied. I think the majority are decent, hard-working people, who speak with their passions and heritage. I liked the Nordic culture, and my Nordic Lord, Uthred, really opened up the race for me. Ive always had a soft spot for them, since Morrowind. Its hardly surprising they weren't prevalent in Morrowind...because, you know, it about dunmer. In every Tes game the "national" race normally takes precedence.
In Oblivion, I thought it was different - Each country seemed to have a different majority race. Bruma, with its large Nord population, I found a perfectly nice place. The Nords of Cyrodill were far more politically correct, softer, and jolly than their harsh - speaking Skyrim cousins.
originally, in the very early development of the game, I remember reading the stormcloaks would independently hire you. They sounded a lot more like a gurilla fighting group than a more organised administration. Despite initially liking the Stormclaoks, and agreeing with their principles, I found increasingly the barbed comments, the dodgy "events" and sketchy characters a little....deflating.....And I renegaded back to my Imperial roots. I don't like Ulfric, and I never will, because ive come to the educated conclusion, looking at the evidence, that he isn't acting in Skyrims interests, or for its people.
My opinion remains much the same, which is they are a very honest, and good people, with a few bad apples that somewhat sours the overall taste.