Once upon a time, Metal Gear. But post-Peace Walker, we had a falling out and a rather ugly divorce over some of Hideo Kojima's more... questionable content inclusions. It remains to be seen whether Ground Zeroes will fix any of this and mend a relationship I really would love to have back.
He's at least promising that the game will cover "very mature themes", so thanks for the heads up, man.
Currently? Skyrim, Castlevania, Devil May Cry (and DmC has only made me that much more of a nutter for the series).