Someone hasn't played Morrowind... Have you ever saw Balmora, Ald-Ruhn, Sadrith Mora, or even Vivec? Morrowind had it great. All of the unimportant towns where small and insignificant, but still had a unique feel. Every fort and village in Oblivion felt exactly the same. That should change.
If anything, Morrowind had larger cities than Oblivion. I don't mean by scale, but by content. If you get rid of the uneccesarily huge roads, you'll see that Balmora has far more than Chorrol. The Imperial City is also supposed to be the largest city in the world. It's supposed to be pretty much a province in itself. (Morrowind cities may actually be to the same scale as Oblivion's)
Also, I'd like to see more easter eggs. They should be hidden, and most of us should never see them. I loved the Cap'ns guide to fishy sticks, and the star war reference in Morrowind. I'd love to see something along those lines, again. It's always great to see things like that.
I'd also like to see more racism. Especially with Orcs. Orcs are newly accepted into the empire, and have been at war with them since forever. People should comment on the brutality, and uncivilised way they see them.
Every rae should have some degree of racism. Some less than other, for example, Imperials, but most should have it, especially the Dunmer and Altmer.