Personally, my favorite genres are FPS's, Survival Horror's, and the like, but really for only a few reasons (apart from fun) In survival horrors, you get the knawing fear, that whatever 'it' is, is coming for you. Fear such as this makes (me, at least) feel so alive. Granted, I've played so goddamn many, that now 'it' is not so much 'OH MY GOD!' and more 'Damn, I gotta whip this fool AGAIN.' FPS's, I feel my preference toward them is much more psychological. See, in the real world (that's 'the physical realm' to you The Guild fans out there) I'm nobody. Seriously. I'm a regular nobody schmuck, that you've probably passed in the street a hundred times. In an FPS, like Halo, though, I'm a big badass killing machine. I'm something to be feared, and respected, or called a stupid homo with no life, when someone can't take a loss.
BTW, Theo Samaritan, you are correct. It does sound like fanboy-ism. But that's ok. I'm a Yahtzee fanboy myself.