I agree that the Parthians are greatly underrated for sieges. Your war elephants can deal with wooden walls no problem. And you can always sap through walls with a few mercenary units. And if you're really needing some help with sieges, remember Parthia can make onagers. Towers are very easy to take out with onagers I find (though gate houses are a lot tougher).
But back to the topic... sapping is hugely powerful. I rarely bother using ladders and siege towers now, it's easier to sap through and bundle in with your shock troops. You can then move infantry in to clear the towers if need be. Sap points should use up far more build points, it's too easy now to simply make a bunch of sap points in a turn and attack. Sapping, while powerful, was hugely time consuming in real life.
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