Hmm, I bought Skyrim and after about 15 minutes I decided I didn't like it.
GTA 4 was cheap so I bought it, although I don't know the series other than it's supposed to be famous. Didn't install it yet.
I got Grid autosport, but my (very cheap) wheel is at a friend and I didn't feel the urge of playing it for now anyway. Also picked up a cheap pack with GT Legends, GTR 1 and 2, etc a bunch others. Might try them at some point.
I also got train simulator 2015 because it was cheap, I am not sure if that was a good purchase either.
The full Valve pack at 17 euro was quite tempting and I can say at least I am playing CS Go (did a couple of hours with a friend and bots anyway), although I had that one before I bought the pack.
My wishlist has stuff like the new Civ, new Borderlands, Kerbal space program, and xenonauts. Neither of these were really cheap and I didn't feel like sacrificing any real money for them right now. I'm sure in a half year or so 50% off them will mean 50% off current price's 50% and I'm not in a hurry. Christmas is costly as it is and I am a poor man anyway.