Dark RP only for kids?

I think it depends vastly on the owners, admins and addons. If its a loosley run server with abusive admins, MASSIVE amounts of useless, lag-causing addons and a player-base with the average age of 12, then its gonna be a bit crappier than say, a proper community set up with admins, a heirarchy and a good amount of addons that isn't going to press even the best of computers.