Star Wars Prequels I and II were the worst.
Why did each "droid" have it's own personality if all of them were controlled by the mother ship? If they were centrally controlled, why would they need audible speech? Why would they need ranks?
I think the story was changed so that they were droids so the Jedi could slaughter them whole-sale with light-sabers without getting the PC crowd in an uproar and an R rating for graphic violence.