1.Fallout 3 ===>=== The Elder Scrolls V:Skyrim
2.Mass Effect 3
3.Mass Effect 2
4.Dragon Age:Origins (Best Storylining EVER!!!!!!!)
I really can't pick between fallout 3 or Skyrim,but I think fallout was slightly better thanks to it's apocalyptic atmosphere and amazing soundtracks.
Especialy the soundtracks.