I enjoy Skyrim for what it is, but if I had the brain and creativity of a developer, and also the flexible voice range, I would change the following:
-Make dragons less frequent, give them more strength (other NPCs are powerless against them) and give them shouts.
-Make it so that there is a alternate faction to certain factions (Other ES games didn't do this, but it would be cool to join the silver hand and wipe out the companions, disobey the dragonborn prophecy and join the Thalmor, somehow manage to control Alduin and use him to turn Skyrim into your destruct-o-playground, help mjoll and the Jarl of Riften stop the thieves guild, ect)
-More Emphasis on you being the only one who can stop dragons!
-Better civil war questline (I know it would be difficult to do this due to all the possible outcomes, but I'd make the civil war quest-line more territory-based. More attack/defence scenarios rather than just whiterun, and also you being able to kill the Jarls, with some neat duelling.)
-Moral choice? I know this would be ridiculous, but I liked it how in games like Fallout, NPCs would make remarks on how good or bad you were.
-The ability to unlock craftable armour/clothing sets after doing certain quests
-Morrowind-style skills?
-Less noisy bears and "YOU PICKED A BAD TIME TO GET LOST FRIEND"
I know it sounds like we're the unpleasable fanbrats going around saying that Skyrim will never be as good as the previous ES games, Nostalgia gleaming in our eyes, but if these were possible (Maybe mods?), Skyrim would be a almost perfect game.
