Lol... yeah, I am a bit behind on gmes since the change to Linux ;^)
I’m not sure Linux can handle the graphic engines of the newer games yet, although I WAS able to get Metro Last Light working... looks smooth as butter so far, just can’t get the sound working yet.
The graphics engines work great on Linux. AMD and nVidia both develop drivers for Linux and the graphics cards work exceptionally well. DirectX is a Microsoft concoction, and most games run on DirectX these days, but many open source games and games like Minecraft run on Java or OpenGL, making Linux an exceptional platform for gameplay.
I develop for Minecraft on my Linux machine since Java is just slightly more stable on Linux vs. Windows.