Archers are at best a soft counter to Crossbows at the moment, I like the identity of the unit in the build they have in campaign better where Crossbows fire slower but have a larger base and bonus against armored units so they can effectively be counted by faster firing archers.
Crossbows have a roughly 1.4x addition in damage vs heavy units
Currently archers fire at a rate of 1.5/s and Crossbows at a rate of 2.00/s
In the build used in the Campaign Crossbows have a fire rate of 3.5/s but a higher multiplier and base damage, I honestly would prefer if crossbows were given back their slower attack speed in exchange for higher damage base/against armored leading to a similar dps against armored units but less against unarmored.