Shadow of Mordor, for me, is probably the most over-praised title to release this year. The game's core mechanics are refined but highly derivative, save for the Nemesis System, and it doesn't have a compelling story or set of characters with which to keep me engaged with it (which is crazy given the game is set in Middle FUCKING Earth.) I didn't get a tonne out of the Nemesis System either but there's definitely room for potential growth there. All in all, by no means bad, just not Game of the Year material, personally speaking.
Also, where the hell have the awards and praise been for The Wolf Among Us? I feel like I'm one of a few who seriously dug it, this year.