I've noticed a lot of new players complaining that their computers have issues rendering stages with 3D graphics. It's most likely because they are running machines that can't use DirectX. In the past, Crusade wouldn't even start on computers if DirectSound couldn't be used. The game would simply show an error pop-up when starting up the game and then exit.
I'm not sure of the best approach, but it should be easier for players to know they have this problem. We don't have to try and "fix" the game for them so that it runs normally, but at least a warning would be nice.