Marx kinda got what he deserved in my opinion; it tends to be the case for Kirby villains. Sectonia became vain, cruel, and self-absorbed, so Taranza switched sides because he could no longer love her as he once did. Haltman wanted nothing but world domination and cared for nothing but it and money, so Susie basically goes and usurps her own dad.
Daroach was just a moron.
A lot of the time they get served imo and it's deserved.