Half-Life 2
As with Assassin's Creed, my progress in HL2 was wiped by a hard drive failure. Unlike AC, I don't plan on going back and playing HL2 again.
Look, Gordon Freeman. We had a good run. But we're just not right for each other. Past the scientist technobabble and the robust physics engine, you're just about navigating through a dystopian future and shooting dudes, and that really isn't doing it for me.
Maybe, one day, when I'm super-bored, I'll try HL2 again. Maybe. Not planning on it.
Progress: Gave Up