The Commands and Colors system rewards a general who can make good use of his skirmishers. They are highly mobile, with the ability to move and shoot AND evade close combat. They cannot provide a killing blow, but they can wear down the enemy with missile fire and slither away from most attackers. I consider CCA's treatment of light troops to be the best I have seen in any game system.
The Gauls have a variety of light foot troops. Archers and slingers act just the same in the rules, with a range of three hexes. Javelinmen and light cavalry have a range of two.
The slingers were the only light troops I had painted for my first army. Everyone else here has come across the painting desk within the past two months.