So far Skyrim is making me want to play more Skyrim. Although I am feeling the urge periodically to beat my head against Dungeon Crawl: Stone Soup again periodically.
I suspect I will play Skyrim near exclusively until Diablo 3 (Temporary distraction) or perhaps Kingdoms of Amalur (which I have high hopes for consuming my life) is released. Graphics are not important to me as long as the story/plot twists are good and there are enough graphics to facilitate the game play properly. These days I am kind of missing NWN (Original), Sacred (Original) and Titan Quest story/plot. Different styles of games but the story/plot and the slow inclusion of new stuff and occasional surprise scripted stuff is really cool.
I miss that in Skyrim, it does not happen much, you do not really change the world per say. I was stunned with surprise when I found a room in a dungeon where columns raised out of the water after I entered. I damn near ran away figuring something really bad was happening and it was entirely passive, just carved columns rising from the water as I walked down the stone runway

Very cool.
I really want to see a new monster in Skyrim, not just a different name for a more powerful version of the same monster

There does not have to be many, but a handful of new models every 10 levels would be nice

It would play havok with the radiant quests though I image as you level out of range of the NPC, that was a bit of a pain in Oblivion at time. I graduated from cats to bears but I still need cat stuff for a quest ... crap

I really found myself originally expecting things like when I restored a tree in town from a quest that it would show up all sunny with fruit and lush and green or when I restored a temple from the Nightmare god to Mara that when I came back to visit, it would be clean and restored. Little stuff like that makes a difference to me and shows some polish in the game and some level of impact on the world. Although, I grant it is very difficult with a more open ended world to manage this properly, little stuff here and there really makes a huge difference in the gaming experience.
That all said, I am really enjoying Skyrim for what it is but I am worried that there are not many surprises left