http://bugs.winehq.org/show_bug.cgi?id=8564
------- Additional Comments From philcostin@hotmail.com 2007-10-06 12:33 ------- Just to be clear, as of current Git, some games WILL look dark. This is because sRGB texture linerization is now supported. Until we implement WINED3DRS_SRGBWRITEENABLE (coming soon don't worry), some textures will be dark because they have been properly converted to RGB before entering the graphics pipeline.
For now, run regedit and try changing to ARB shaders (or turn up your monitor gamma). If that doesn't work (because the game checks for the feature anyway), try using the latest non-git version of wine.
D3D is still under development and some games will use the feature now it's available. The fix will come when the additional functionality mentioned above is available.