Honestly guys, I find the unmounted ranged units in this game to be very specialized in their roles. Archers and Crossbowmen are amazing at defending bridges and walls, but they are less than stellar in the open battlefield. Given the dominance of Heavy Cavalry in this game, unmounted ranged units (with the exception of certain units like the Almughadvars of the Spanish) are often too troublesome to be worth the time. They only deal minimal damage (2-3 flights of arrows/bolts) before initial contact and are left to either sit around or join the melee with subpar secondary weapons. There are only a few ranged units that I would constantly add to my armies regardless of type of battle, and they would be:
Longbowmen (Stakes are amazing)
Janissary Archers (Once again...stakes!)
Genoese Crossbowmen (Prolific melee fighters)
Adventurors (ARMORED longbowmen!)
Musketeers (Can cause serious damage)
As for the rest...like all the pavise crossbowmen and archer militia, etc, I would never use them as another unit would play a more active role in my military machine. Granted, I am a VERY big fan of missile cavalry, so I am biased