Honestly, I've taken up the policy of a guilt-free reset whenever I upgrade my console.
So my current Wall of Shame is Killzone: Shadow Fall, Outlast, Dead Nation, Resogun, Don't Starve and Child of Light.
So now I've got a PS4, I'm allowed to ignore PS3 games.
And with strategy games, I've taken up the policy of completing a single campaign and then moving on. With story games, I just finish the story and move on. Is a game shit? Move on, guilt free.
On my Steam Wall of Shame, currently have installed Dark Souls, Far Cry 3, Europa Universalis IV, Beyond Good and Evil, Deus Ex (the old one), FEAR, L.A. Noire, Long Live the Queen, One Finger Death Punch, Saint's Row 2, Sleeping Dogs, To the Moon, Tropico 4, the Witcher, the Wolf Among Us and Walking Dead Season 2.
I've also got Civ 5, but me and my girlfriend play that together; probably where 90% of my gaming time goes. I have about another 200 games, but I'll install them as I finish these games. I am lucky enough, I believe, to have so many fantastic games to play.