The enemy's weakness is his uncertainty.
Astrotrain thrives on panic and fear. Though he is mainly used as a transport vehicle for moving warriors and supplies, he only truly feels at home pounding Autobot warriors into scrap metal. His ionic displacer rifle can scramble Autobot sensors, causing confusion in the enemy ranks, and his huge bulk casts a terrifying shadow across a battlefield. Those Autobots who survive a fight with Astrotrain often need only hear the echoing boom of his engines in the distance to once again quake in fear.