XCom (the original), Command and Conquer, Starcraft, Doom, SMAC, Dark Souls. Basically I like Stratetgy, Tactical and Action games. And of couse, H-Games too.
my top favorite is hard...so will be generally general with a top 3 and say Okage:Shadow King,SMT(Persona's,Devil Survivor's and Digital Devil Saga's mainly) and Disgaea's