Well, Wine is okay. Its okay, not great. That's because windows programs are meant to be run in windows.
There are, however, a number of good linux games.
All of them are free.
Here is a great article:
25 Top 3D Linux Games » Sathya Says
Here are some linux games and screenshots that I play.
Balazar- RPG
Netpanzer
AssaultCube- FPS
Open Arena- FPS
Abe- A sidescroller that is oddly fun
Battle For Wesnoth- Strategy
Billard-GL A pool Game
BZflag- An oddly fun tank game. Bad graphics...but it really is fun. Multiplayer with servers is just a riot.
Chromium- A top shooter like the arcade games of yesteryear
