Balance of Smarty, and perhaps other defensive structures
The AI took a region and fortified it with 4 closely-spaced Smarty systems. I pulled up with a battle group consisting of a T2 Zeus, 2 T1 Brute squads, 2 T1 Archer squads, and 1 T1 Scout squad. That small group destroyed all four Smarty systems, not losing a single squad. I think Smarty Systems could use a buff. I haven't yet tested other defensive structures.