It'd be easier to list the games I have gotten into. Between Steam, Blizzard, Uplay, and Origin I have well over 250 PC games (226 in steam alone). How many have I played for more than a few hours? less than 10% safe to say. I own but have still yet to get into any of the Metro/Assassin's Creed/The Witcher/Mass Effect/Deux Ex/etc series.
With extremely limited time as a working dad, I find myself regularly falling back on games that I know well rather than investing much in learning how to play something new. So, I end up playing a lot of Batman, Borderlands, Bioshock, Civ V, X-Com. And even those I really only made time for by giving up WoW a few years ago.
Oh yeah, and I never even finished HL1 or HL2, much less the next episodes. And probably only played Portal 1 for about 35m. I'm a terrible gamer.