Skyrim, 11/11/11 can't wait.

Seriously, If you've ever played an Elder Scrolls title before (the last two were Morrowind and Oblivion), you'd understand. Can't beat it when it comes to offline ARPG's. Storyline owns, the freedom owns, its great.
(I see you have played fallout, that is the same company who makes TES titles, Bethesda)