After watching a M.A. lose to a fortified pikeman (across a river, metropolis, the M.A. got down to 1 hitpoint), I think it is time to re-introduce firepower.
In Civ2, I believe they had firepower numbers for each unit, which represented a technological level such that tanks wouldn't get beaten by pikemen. Tanks and other advanced units should not have difficulties with a pikeman.
Civ4 really needs a way to determine the technological power of a unit. Using only the A/D numbers seems insufficient. Some modifier to affect these A/D numbers when units of different tech levels interact.
In Civ2, I believe they had firepower numbers for each unit, which represented a technological level such that tanks wouldn't get beaten by pikemen. Tanks and other advanced units should not have difficulties with a pikeman.
Civ4 really needs a way to determine the technological power of a unit. Using only the A/D numbers seems insufficient. Some modifier to affect these A/D numbers when units of different tech levels interact.