I think you missed a certain kind of fag: atmosphere fag.
To me this is the most important aspect of a game. Ambient sounds, musical soundtrack, artwork, voice acting, color palette, graphics design. When all these things flow together towards a consistent cohesive whole, a game has a distinct atmosphere and sucks you into its world. Icewind Dale 1 has a very rich consistent atmosphere. Whatever you might think of the game itself, Black Isle Studios, nailed the atmosphere down to perfection. VTM: Bloodlines and Arcanum are also very consistent and have well developed atmospheres.