I'm also gonna argue that the Ood were never villains, nor were the Silurians. The Ood in "The Impossible Planet" / "The Satan Pit" were dangerous, certainly, but were being controlled by the Beast (much more worthy of the title "villain") and the Ood in "Planet of the Ood" were also not in control of themselves, particularly evident in the behavior of the Ood who was found shot in the snow. Plus, the villains in that episode were the humans who were selling them as slaves, Halpen being the obvious baddie of the episode. As for the Silurians, the only true villain among the New Who Silurians was the warlike Restac, who was unwilling to negotiate and rejected peace between humans and Silurians. She called an army to war to wipe out the humans while others of her kind urged her to stop.
But again, loved the quiz.