It was just this particular game that hooked me up. And yes the problem is the ladder system which makes it never-ending. There is always another human of about your same level range to play with, available with just a click.
Well, gaming is for everyone, that's what I think. Given a person, you can find or build an appealing enough game for her to enjoy it. Well, barring stigma-aversion, prejudice, etc.
Seriously, though, try some single-player games. Max Payne 2, Machinarium, Fallout 1/2/3/New Vegas, Planescape Torment. My view on this is: deversify your experiences; there's a certain limit on how much you should play a single game for your own good, because at some point the experience becomes more miserable than positive.