FPS- War Type, Racing, and Fighting most 2011-2012 games
Here we go...........
Half Life series
Call of Duty 1-4
Far Cry
Crysis
Crysis: Warhead
Battlefield series (esp. BF2 and 2142, lots of mods as well!)
Grand Theft Auto series
STALKER series
Mafia II
Metro 2033
Rainbow Six: Vegas 1 & 2
Team Fortress 2
Counter Strike: Source/Global Offensive
Tropico 3
etc.....
I mean really, pretty much any mainstream PC release in the past few years has been pretty good. Even the "average/mediocre" ones (like FEAR 2, Medal of Honor: Airborne) are really not bad at all. They're the ones you buy on sale
As much as I can say I hate consolization, it did bring some actual improvements in average quality and production value of mainstream PC games. Of course the PC is still where you can experience the best versions of multiplatform titles. The
best, most intersting, and forward thinking games I would still say are very PC centric titles.