A couple of comments about naming the games.
Morrowind, Oblivian, and Skyrim are officially named Elder Scrolls III Morrowind Elder Scrolls IV Oblivian and Elder Scrolls V Skrim according to the Bethesda site. However, since everyone always refers to them with the Elder Scrolls preface (at least almost everyone) to make it easier I have listed them as most people do.
Also, the official title for KOTOR 1 and 2 is Star Wars Knights of the old Republic and Star Wars Knights of the old Republic the Sith Wars but again everyone always refers to them without the Star Wars prefix so to make it easier, I again chose the most used titles.
Tomb Raider: There are two. The original game from 1996 is called Tomb Raider. The most recent game is called Tomb Raider as well. Therefor to differentiate between I have chosen to name my preference on this list Tomb Raider 2013. In the event someone might possibly list the original TR that might want to be taken into consideration.
That said, here are my 13 with some games with hurt feelings
not making it this year.
Kingdoms of Amular The Reckoning
Knights of the Old Republic
Knights of the Old Republic II the Sith Wars
Tomb Raider 2013
Tomb Raider Underworld
Vampire The Masquerade Bloodlines
Some that would have liked to make my list but got cut are:
Betrayal in antara
Dragon Age 2