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Heh, people often write about gameplay, especially inexperienced players, saying that you need to play using archers. After my recent games, I've been thinking about this a lot. Even the Wanderer, for example, praises monks and always carries ballistas. Maybe I'm just not very good at the game, but still...
Let's analyze this using the example of 3.55 (enhanced version with levels 1-3 for all factions). Monks have 65 HP and some damage. There are no Angels or cavalry yet, so you have to fight with them. You need 5-7 of them. As it turns out, you need a lot of mana or wells along the way, especially if you need to get through without any losses (even a shield unit, which is essential). When you have enough mana for healing throughout the battle, as well as Bless spells, and a second mage can slow down the enemy's advance, then you can more or less survive. But as soon as you run out of mana, big problems start, and you often lose heroes - and that's at least a loss of tempo.
It's much easier to play with Crusaders - cast Regeneration and maybe Bless, and then just carefully watch the battle, not spending too much mana and keeping the mobs away from the heroes.
Ballistas are just too slow