Hit the nail on the head.
If you have to make stuff up to make a game entertaining. The game is bad.
I find it a bit opposite, if I play a RPG where everything is set in stone i am "forced" to play that specific role and have very little freedom with the character overall those games have to deliver on story and game mechanics to be remotely interesting. TES for me has always been about me making my own story based on the available RPG mechanics. And Skyrim have some elements that are weak some that are better then previous games, and best of all it allows me to create a character as I want too. Skyrim isn't the best RPG if we look at mechanics itself, but it still allows me to create my story on my character without it trying to constantly dictate my playstyle or background.
It is all about how people roleplay this boils down to, some prefer rules that are set ins tone and allows them to play the role they choose. They don't want to create a big background story, they don't want to use their imagination more then to a certain point they want the game to entertain them not to use the game as a tool to create their entertainment. Then you have the other part who wants the game to simply give you the tools necessary to create your own story, to define your own role and to allow imagination run wild. For me TES games are about making my own character and living it as I see fit. There is enough RPG's that sets rules in stones and allows you to enjoy the story they have created, TES have never been about pushing the player forward with a story, it is about the player doing what he wants to when he wants too. In the end it all boils down to personale preferences and playstyle, there are elements of Skyrim I would like to improve upon. Some I have with mods, but the elements that bug me the most have always been handled not so well in previous games also.
A difference with Skyrim and other RPG's like DA:O is that Skyrim to a large extent relies on the player and his/her creativity when it comes to make the story. You can if you will simply ignore the dragon threat, or ignore all quests and just be a hunter or a thief, or a whatever you want to be. Skyrim gives you a certain amount of tools needed to create your character and live it, it doesn't push you in any directions it doesn't force you to do this quest to move on and unlock new areas. DA:O did this, you could assume the role from a selection of starting points, but then the story kept pushing you on until the end. You didn't have the freedom to what you wanted when you wanted, a lot of things were dictated by the story and your progress in it. TES is in many ways a blank book delivered with the tools to color it and write the text of your story. While DA:O is a written book where you simply play the story and are given a set of choices on how it will turn out.