@Classic-Burger I use 25-30. Atleast at my level, (1400, whatever that might mean) it works against enemies. You can snipe away cavalry, and a few spearmen close by is easy counter to melee cav civs.
You can camp around the enemy with archers and elephant. But the sight and vision that you mentioned would be fun, but I think it's not completely fair since you can't tilt the camera to ground level to look at the forest floor. Hiding watch towers is interesting too, but easier to spot. Is Praetorians a different game?