I bought DayZ, XCOM: Enemy Within, The Wolf Among Us, Victoria II plus the DLC expansions, and the Skyrim DLCs.
From what I've played in DayZ, I hope that the hunger and thirst meters are fixed soon, it seems to me like if you don't drink a gallon of water and a can of food ever fifteen minutes you face starvation. That, and the really long intervals between spawnable items, means that it is almost never worth it to scavenge for items, and instead it is much easier to kill other player to grab their stuff. They really need to work on that if they plan on making the game reward co-operation over simple deathmatch.
The Wolf Among Us was pretty amazing, I'm glad the next episde is set to release a month from now. I can't imagine having that cliffhanger over my head since October.
The rest of the games I haven't had a chance to play yet, but I hope to do so sometime soon. But yeah, this Steam sale has been pretty great for me.