Batman Arkham Knight
By default this is probably my GOTY.
However, I feel this needs to be said.
The Arkham Series as a whole is so very overrated. Still good games mind you, but they are so overrated. Which is how garbage like Origins got a free pass from most people. Since it was a reskinned Arkham City with a terrible fan fic storyline.
Knight doesn't have that problem. It has it's own identity. Which is why it is such a polarizing entry, people don't like change. However you can tell I enjoyed it since I don't have a compelled need to track down every copy and burn them like I do Origins. In general it was a solid conclusion to the series with great tweaks to the normal gameplay and the addition of the Batmobile. Which many had been requesting since Asylum (Even if they didn't like the end result). The tagline for the game was "Be the Batman", and honestly, I feel it's appropriate. It's the first game in a long time where I wanted to get all the side content done, go through it on NG+, get all the upgrades, and generally be the best Batman I can be. It's rare when I get that drawn in. It was a solid game with the most refined gameplay and graphics of the series, and a storyline that utilized nearly every important character in the Batman Mythos, and despite some of it's problems (PC release, Season Pass cutbacks) I very much enjoyed it.