On PC I've mostly played some variety of a shooter, whether that be Arma, DayZ, PUBG, Titanfall 2, Siege, etc. I'll be playing Destiny 2 when it releases. In the past I used to play a lot of CoD, but I got away from that as I moved to PC and the series became something that I no longer enjoyed.
Edit: I've also played a good bit of Terraria, Minecraft and Diablo 3 but those tend to be more sporadically played. I play a lot of single player games as well.