I bought Arma 3 (a military style FPS) on a steam sale (including a cool expansion involving a UFO scenario) and more recently, ATOM rpg.
I checked it out because of the buzz here and it does indeed look like a cool old school top-down rpg with Fallout-like vibes.
And my most recent game purchase was the new Call of Duty: Modern Warfare. I had to buy that on the Blizzard game launcher. Unfortunately, I can't play it because I'm getting a Dev error upon trying to start the game and there isn't a patch yet for it.
Lastly, my next game purchase will probably be pre-ordering Red Dead Redemption 2 from the Rockstar games launcher. I normally never pre-order, but Rockstar is giving a good deal right now if you pre-order by giving you upgraded special and premium editions that are $20 less than the normal price.
In addition (and what cinched it for me) is that they are giving away a free Rockstar game (you choose among a handful of titles) and one of the games they are offering is Max Payne 3 which is a good shooter game according to reviews, and one I have had my eye on in the past. It's a $20 game on steam and Rockstar is giving it away for free when you pre-order RDR 2 using their game launcher, which is a pretty damn good deal.