Yes, tactical AI sucks, but it's improving. Right now, the AI only cares whether it has range. It should care whether its range is stronger than the player's and whether its melee is weaker than the player's.
Hell, the original Age of Wonders had tactical AI that was pretty good at figuring out whether it should rush or defend. I'm sure that Stardock will get their tactical AI fixed, once they focus on it. Sure, it would have been nice to have it done by release, but that's water under the bridge.