I hate Mortars and Bombards with equal measure. I find ballistas mostly useless (taking up a whole unit slot, for one hit/one kill each round), but if I have a high-command general, I VERY occasionally use them as snipers against attacking armies.
Serpentines aren't very destructive against big walls, but they are extremely accurate and therefore good against massed units of attacking troops.
For non-gunpowder, I use catapults, and add Mangonels x2 for big castles when I can hire them as mercs.
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