DLC gets a bad rap but sometimes, it's pretty great. I'm playing Red Dead Redemption's Undead Nightmare DLC and I'm loving it. Had it for years but never got around to it.
So what's the best you've ever played? Mario Kart 8's tracks? Gears of War Raam's Shadow? GTA IV's Lost and Damned/Gay Tony?
What's the best and why?