Define "better AI"

[Elmar Bijlsma]

The prime objective of AI should be suspension of disbelieve.

I fully realise it'll be some time yet before AI can match a human player. But atleast it'll has to fake knowing what it's doing to a credible level. I have no big problems with the AI not being able to defeat my wave of uber skirmishers. But I do demand it tries. Every time it just sits there hoping I will run out of ammo before it runs out of men:
I don't demand that it should be very good at breaking into a town, but every time I see it standing infront of my towers until killed:
It doesn't have to be succesful at repelling my sieging attacks. But every time I concentrate all my forces on a breach and 50% of the enemy troops guard intact sections of wall on the other side of the town:

It doesn't have to be a tactical genius or even mildly competent even, AI can never be truely challenging to a competent player. It just has to prevent me from going GAH! every battle. I want to grab victory by the throat, not have it gifted to me on a silver platter by the opposing force.