Any story can be made to seem one-dimensional and simplistic, if summarised in a certain way. Bonus points for naming these literary works (but beware of spoilers):
1) A small person with no heroic qualities is persuaded by a wizard to steal treasure from an evil dragon.
2) A hero responds to a king's request to slay a monster. After killing it, he also kills its mother and becomes king. Later, he dies fighting an evil dragon that's attacked his kingdom.
3) A teenage princess with the only three dragons in the world begins a voyage to her homeland to kill the bad men responsible for usurping her father's throne. Meanwhile, evil ice demons invade.
4) A hero, after surviving a long war, travels back home and fights monsters on the way. Upon his arrival he kills the people who moved into his house and mistreated his servants.
5) Several small people lacking heroic qualities travel with a party of heroes and wizards to a volcano to destroy an evil god's all-powerful magic ring.
They all sound pretty bad!
Assuming Alduin and the dragons aren't the sole enemies, I suspect the more mortal "bad guys" in Skyrim might have some interesting reasons indeed. I bet some of 'em are Altmer... with the whole lost divinity grudge. Besides that, there's a civil war to consider, which promises to be a much less black-and-white, much more human sort of conflict; even if it is only a backdrop to the more mythic elements.
I'd also like to add:
#6- A small boy from Britain with a weird scar on his head learns that he's the Chosen One who must destroy an evil litch. In the meantime, he attends a magical school and plays the school's magical sport. Oh, and he's an orphan b/c his parents were blasted by said evil litch.
#7- A small girl falls down a hole and has a weird dream of talking bunnies, walking animated playing cards, and a queen who wants to cut off heads for no apparent reason.
Now for videogames:
#8- An unknown ship commander must gather allies all over the galaxy to stop an invasion of Earth from evil killer spaceships.
#9- A kid in tights and a green dress and a funny green hat has to save the world from a pig demon. He's guided by fairies, talking boats, talking hats, ghosts, and nvde imps from the netherworld.
#10- A fat, stereotypically-Italian plumber must save a princess from a freakish turtle demon.
#11- A young man/woman must save the world from an evil guy with mask, an evil tower, and evil dark shadows all while guided by a blind girl.
Now for TV shows
#12- Some kooky, goofball dude in a blue box goes back in time and beats up monsters. He's 900+ years old, yet only takes young adolescent girls as his companions, falling in love with some of them.
#13- A cartoon series about a talking sponge.