Current GOTY: Witcher 3 - The writing was stellar, the combat found a middle ground between 1 and 2, the alchemy was accessible, consumables worked well in that they encouraged new combinations without penalties (resting to regenerate potions/bombs was brilliant), and every part of the world felt lived in. Sidequests had relevant issues and felt different, despite all being fundamentally the same. As a fan of the Witcher series as a whole, it felt like as good of a payoff as an interactive experience could be. The developers having post launch support and a trickle of new content for the months after launch was also great. I can't wait to jump into the new DLC when I get a chance, and I haven't felt that way since BL2's Dragon Keep.
Runner up: MGSV - the best unfinished game I've ever played. Regardless of story, the moment to moment gameplay is just fun. It's open to experimentation while being effortlessly familiar. I cannot wait for the online component to hit PC.
I still haven't played Fallout 4, and don't yet posses a PS4 to do Bloodborne.
Disappointments:
MGSV - It is noticeably unfinished. Elements like base management feel half baked, weapons blend together near the end of the tech tree, the villain's forgettable, the retcons are bad, the writing's consistently juvenile and convoluted (even for MGS), and Chapter 2 is a whimper. Every part of the game feels like it got cut down during production. It's still an incredible game, but it just reminds me what it could have been every time I open it up.
XCom 2 and Persona 5 delays. I honestly expected them to be competing for my GOTY, and it's sad to see them delayed. Don't get me wrong, I always want better games and that takes time, I just wanted better games now.
Arkham Knight have a shit launch. I was ready to pick it up and lose a week to the series yet again. I won't be paying more than $20 for it now. The PC release was a mishandled shit show that's only gotten worse in the closing months. They had so many chances to earn back good will, but seemed hell bent on burning bridges.
Overkill. I was ready to get back into Payday 2 with some friends when all the new content was promised with the community event. I did not play it, and never will again.
Mad Max being mostly filler content. I wanted more than a giant collect-a-thon in the desert. Granted, now that Batman's been pushed back indefinitely, it might fill that Riddler trophy shaped hole.