I have to say the major problem with sieges is that the enemy doesn't let me range them at all, they just send all their units to scale the walls, they run around the sides and climb up the walls and then run to the flag in the middle, Now I don't know how else the enemy should go about it but it means your fighting off his units one at a time and there must be a more efficient way for the AI to attack and win, theres only so much you can do against a fort but yea, I wanna be able to pound him with alot of mortars before he attacks :P ruins my fun just rushing everytime, and then sometimes the artillery won't do anything and sometimes he won't do anything except shoot his artillery at the indestructable parts of your fort... it certainly can be improved.