1. Torchlight II
Nearly everything D3 did right with none of the things it did wrong; the original torchlight was the first iso-ARPG I put any serious time into, and I fell in love again with the sequel.
2. Darksiders II
fun puzzles and combat with an EXCELLENT artstyle Darksiders 2 did a lot to build on the original while still keeping it's own unique play style, and left me waiting for (hopefully) the eventual 4 player co-opocalypse.
3. Total War: Shogun 2: Fall of the Samurai
Stand alone expansion for my 2011 GOTY, Fall of the Samurai did everything TW:Empire failed to do; it made the AI much more competent, artillery fun and easy to use, and added some interesting dynamics to the campaign map.
4. Guild Wars 2
While still not totally perfect, Arenanet took some interesting risks in the world of MMO design; ultimately the game is extremely fun and engrossing and will only improve with time.
5. XCOM: Enemy Unknown
An excellent strategy game in a style we don't see often enough, I hope XCOM's success will cause more developers to make intense, small-scale turn based games.
6. Legend of Grimrock
Dungeon delving at it's finest, and with the newly added dungeon editor it looks like it'll stay installed for a LONGGGG time.
Supremely hard platformer not unlike Super Meat Boy, another all-time favorite.
8. The Walking Dead
A landmark in storytelling, what can I say that others haven't?
The puzzles kept me and my brother up till nearly 5AM multiple nights in a row, deciphering the language and symbols over skype so we could compare notes on the web cam.
10. Diablo III
The first "diablo" game I played, D3 kept me enthralled with it's amazing combat and design; the weak world randomization and technical stuff (the always on DRM and auction house) are what drags it to the bottom of the list, but I can't ignore any game I enjoyed for well over 100 hours.