All the games. It's a rare game that I play to completion. My butterfly-mind is too easily distracted to give most games their due. Casting a blood-shot eye over my Steam list, the last game I completed (the main story, at least) was Mark of the Ninja, and before that Arkham City. For someone who buys at least a game a month, that's poor. Oh, and Torchlight 2 too.
And the games that I "complete" aren't really complete because I'll keep chipping away at them for weeks, approaching but never quite reaching 100%. Either I play a game for a few minutes and never look at it again, or I play it for many hours a day for a fortnight until something else comes along and it gets shuffled to the back burner, where it languishes until I need the precious bytes.