I just went to the AppDB on this same website and typed in "Warhammer." There have been several documented tests of Warhammer Online, and most of them come back "bronze," which means the game may not be enjoyable in wine. The most recent test reported "silver," which is hopeful, and was dated January 2010 on an older version of wine. I'd say try it and see if you can help us make it better.
