Mine would have to be Fallout 3 or fallout new vegas... I love the amazing amount of freedom that the games gives you, its great. The large quantity of weapons, apparel and gadgets you can use is outstanding and the questlines are actually bearable unlike a lot of other games that offer the same basic thing for every quest... And the mothership zeta add-on is just WOW! I know that they were not released this year but still my favorite all around game.