I think Elder scroll V will the next 120 + hour epic. BioWare will deliver another top notch story with DA2.

I think what is key to BioWare is story, yes some other titles may have been longer but DA, ME 1 & 2 all had epic stories.

Oblivion and the like, maybe even the witcher, was more of a "create your own adventure" game. I personally could never get into the Witcher.