The paper shows that Klein's contemporaries, Freud, Winnicott, Payne, and Brierley, among others, were outspoken critics of Klein's theories. In the forty years following Klein's death, ample clinical and research evidence has accumulated to show that the fundamentals of Klein's theory are indeed wrong, that Klein's contemporary critics were right. Envy is not an innate oral-sadistic and anal sadistic expression of destructive impulses but a frustration of basic attachment needs. The infant is not innately cannibalistic. There is no death instinct. Aggression is not innate, but a response to threat. There is no good or bad breast as a thing. It is a metaphor for relationship. We owe Klein a debt for her insistence (object relations) on the now proven importance of pre-Oedipal experience in the development of the human inner world. The author argues that it is urgent for psychoanalysis to develop greater consensus in theory in order to protect the talking cure from current attacks. The current live-and-let-live approach to theory has outlived its usefulness.