1. Inferior range of Void plasma cannon. It should be same range as Xeno plasma cannon. This has become more obvious now that the Void Bombardment Torpedo is out
2. Circuit shield only protects against Void damage, Ship and armour available only has resistance to Void damage. So they're only meant to fight other Marauders? This is, for want of a better word, stupid.
3. Circuit shield has high repair time, 50% longer than other shields except exophase, making a lie out of the "lower repair time".
I suspect Kixeye hasn't really been thinking through the Marauder faction. Currently, it doesn't make much sense to build them because their disadvantages outweigh any advantages. What are the advantages? Oh, higher dps weapons. That's it. Not enough.