I have always said that Oblivion was the best game ever. And this has just topped it in so many ways.
The amount of different paths that you can take is literally endless, and there are so many new additions since Oblivion with numerous new faction quests as well as keeping with the old and beloved ones such as the Dark Brotherhood and the new version of the mages guild and fighters guild.
Just get this game, simply the best game ever.
(P.S get the strategy guide, since the skyrim uesp wiki is not complete the strategy guide is so useful.)