Argyle King
Legend
I would much rather play D&D with the English system than the metric system. It is not that I don't understand the metric system. I am an engineer and can go back and forth no problem. I just greatly prefer the English system and I think most of the market does as well.
I have a played a fair amount of D&D with people from overseas (Austrailia, Russia, Netherlands, Israel, Germany, Romania) and the English system seemed to work fine in those games and with those players.
I'm good with yards.