Saints Row 4 for my GOTY and my PC exclusive of the year was...
EURO TRUCK SIMULATOR 2.
No, I'm dead serious. I caught my SO playing it and had a good laugh about, but then my SO told me to spend just an hour with the game and I got hooked. It's the ultimate game for unwinding after a long day. Driving my truck down a european highway while listening to european radio stations in real time is amazing. And the best part is, we're getting multiplayer so pretty soon we'll be mashing each other's trucks off the road and cussing each other for causing traffic jams.