not my most played genre but i do enjoy them when i play them.
im not playing any at the moment but have played a few including most the RE series, alan wake, and a few other pc games.
there are a few fps games that are not strictly horror but do have sections where they can evoke that type of atmosphere.
games like the stalker series, fear, ghost forest "doom mod", pathologic, vtmb, all have really well done horror sections in games.