What has been added? Pretty graphics? Thats the fluff. If that is all you want just watch a movie or something. The game has become less complex as compared to it's first iteration almost 20 years ago. Just get a graphics demo or something and run around then. The game is just not intellectually stimulating at all anymore. It's pretty, its fun to wander around and marvel at how well technology has improved that a large landmass can be created that looks so nice.....but if it is empty and devoid of any purpose. Well then its just a empty world with a face lift. I think they spend a lot of time and resources on sound and graphics, but the core game play is just secondaray to the whole process. When it should have been the most important aspect.
The games AI has not improved at all. Since what maybe even Morrowind? I mean they could have gone the opposite direction, they could have made combat quite awesome, impact detection for body sections, enemies that really surrender, cripple enemies, stun them, daze them...but nothing like that got added. I would so much prefer combat with extra stuff in it supported by better AI then some of the graphics. And honestly the graphics in this game are not that great. All games are looking better as technology improves.
Better, more believeable and fantastic environments (Lost Valley Redoubt). No more "Patchwork" biomes like in Morrowind. Cities are more expansive, if smaller in terms of population. Architecture is also better.
Dwemer Ruins are much better this time around with the traps, bot-dispensers, locks, new inhabitants. Also, the roles of the various automatons are MUCH better defined: Spiders are janitors, Spheres are Robo-cop City Guards, while the Centurians are the Dwemer way of saying "Look What We can do!." In
Morrowind, they were just different tiers of Guard-dog.
The NPC conversations give much more depth to the world - There have been times I've turned around and left Bandits in peace after overhearing their conversations and musings, and regretted having to kill or being unable to save some of them... I wish Bandits weren't so eager to jump on my blade. The world feels a lot more "Alive" and the verisimilitude is stronger. Monsters have much deeper lore behind them this time - While
Morrowind's creatures were "alien", in
Skyrim, I can read about the various creatures, finding the depth behind them that their sword-mounting tendencies try to mask, but I can see from a distance from quiet observation. (I have yet to replicate the Draugr assimilation experiment, however)
While the combat AI may not be too great, the Radiant AI can be fantastic at times. Beggars love it when I shower town with gifts. Also, there can be some crazy fights even with the limited AI of individual combatants: Fighting bandits, a Dragon flies overhead. Giants and their Mammoths get aggroed, and bring Mudcrabs behind them. Sometimes, the AI decides you're not the biggest threat in a massive rumble. Other times, you get ganged up on by the worst possible combinations of creatures at the worst possible time. Luring people into vicious traps and the myriad uses of well-timed Dragon Shouts never get old for me.
Radiant Story's "generic" quests may be routine, but it's the routine that gives the world verisimilitude - Bandits rove around and need to be taken out, houses need to be cleared of Sabrecats because the owners can't figure out how to keep the doors closed, and sometimes, people lose things in the darndest places. (I think there are one-way portals behind the back of Skyrim's couches that lead to the deepest points of random caverns).
And, the world has a deep history behind it, carved in stone and standing after eras have passed.
Morrowind had a lot of "History" to it, while
Daggerfall and
Oblivion were focused on the "Here and now". Skyrim has a strong sense of both past AND present in its lore.