I certainly think seiges need a bit of work still. It's far too easy too take a castle at the moment, especially pre-gunpowder, at least compared too how it was historically.

People built castles for a reason back in those days, and those reasons did not include because they fell too anybody with the same amount of troops and a catapult.

I don't mind at all the fact that castle walls go down to gunpowder but something out to be done about the pre-gunpowder era. Remember Constantinople didn't fall until the turks used cannons to destroy their walls. A ballista can do it at the moment.