Donna saved the world and the Doctor multiple times over.
She helped defeat the Empress of the Racnoss.
She helped to free the Ood from servitude.
She helped stop the fighting between the humans and the Hath.
She had all these memories from a life lived in the CAL hard drive.
She saw Pompeii. She met Agatha Christie. She saved the whole of reality.
Donna saw how much she actually mattered and how much she helped the world. And she doesn’t remember any of it.
Her ending is so goddamn bullshit.