Suppose you have this arrangement: M L L L L M M M M M M M m m m m m m Where M=macemen, L=Longbowmen an m=musketmen. The longbowmen have an unfair advantage because of the Range issue. The Musketmen will have to face this field of fire while trying to defeat the Macemen in hand-to-hand combat. Personally, I already thought the Musketman was one of the most unfairly weak units in Civ4, relative to other units that were likely to appear during the transitions leading up to and immediately after Gunpowder. In historic battlefields the musket advantage over archers was decisive most of time, in part because of the psychological impact of gunpowder.