Hey, I don't have a problem admitting I play the occasional game, and I'm an old fart compared to most of you! Of course, being an old fart, I keep mine limited to what I can find for the PC...that being said, I have a pretty serious PC to handle them, too. I haven't been buying much lately, so my titles are a bit older than most--I have quite a few favorites, but these are three that come to mind, in no particular order:

COD 4
Doom 3 (yeah, I know it's old!)
H.A.W.X.

I like shooters, typically military-based (not gangland stuff), plus both flight and driving simulators. One of my all-time favorite drivers is XPand Rally, an awesome rally racer with incredible physics modeling, but alas they never updated it for later operating systems (XP was the last one it worked on, and I have left that behind).