On Steam I've got 3 folders. One for games I'm currently playing, one for games I finished, and one for games I haven't finished and don't intend to. Happy to say that the "finished folder" is bigger that the "don't intend to finish folder." That being said, here's a few games from that folder.
Castle Crashers: Too repetitive
Dark Souls: Tedious
Divinity Dragon Commander: Too complicated
Dragon Age Origins: Bugged out on me, really liked it too
LA Noire: Boring
Magicka: Boring
Civ 5: Too complicated
Terraria: Tedious
Trine: Trine 2 is better
Witcher 2: Too complicated
Castle Crashers: Too repetitive
Dark Souls: Tedious
Divinity Dragon Commander: Too complicated
Dragon Age Origins: Bugged out on me, really liked it too
LA Noire: Boring
Magicka: Boring
Civ 5: Too complicated
Terraria: Tedious
Trine: Trine 2 is better
Witcher 2: Too complicated