Apologies for late reply (been out and about!), but I'm a big advocate of gaming on Linux.
My weapons of choice? I'm very lucky because most of my favourite Windows games are also available on Linux!Eschalon Books I and II
: two old-school isometric RPGs with stats, dicerolling etc. a bit like Baldur's Gate, for example. Very atmospheric, you can tell that Basilisk have put a lot of love and attention into these games. I've probably played these more than Skyrim http://basiliskgames.com/Amnesia: The Dark Descent:
an utterly terrifying first-persona survival horror game, inspired by HP Lovecraft. This is considered by many in the PC gaming scene to be a real classic. http://www.amnesiagame.com/#mainBraid:
an award-winning and engaging platform game with beautiful handpainted graphics and a fascinating gameplay mechanic involving time, where some levels 're-wind' etc. http://braid-game.com
: a wonderful, vector-graphics-based retro shooter/rts based inside a computer, it's serious eye candy as well as being a glorious gaming experience. This is another real classic PC game by Introversion, who also made the wonderful DefCon and Uplink (also available on Linux)Psychonauts
is also available, another cult game on Windows, which didn't get the recognition it deserved on release.
With Valve porting Steam over to Linux, and having discovered that the Source gaming engine works really well on this platform, and other initiatives such as the Humble Bundles insisting on Linux ports for their games, and the improvement of WINE as well, I'm happy to suggest that Linux is becoming a viable gaming platform. Steam is great for small Indie games (sales of Braid, for example, really took off when it started selling on Steam), and is what I use it for mostly.