HadouKen24, why?

Because she sucked at philosophy. Her epistemology and metaphysics were not even close to sophistication and nuance of the works of the Vienna Circle, whose philosophical contributions were similar in aim and attitude, but far superior in quality. She did not come close to answering the challenges presented by the pragmatism of William James or the holism of W. V. O. Quine. (The Quine-Duhem thesis pounds the last nail in the coffin of Objectivism.)

Her ethical thought, while correct in its rejection of a hard fact-value distinction, nonetheless failed to account for or take into account important facts about human nature and psychology. As a result, it is abysmal--not only wrong, but horribly and dangerously wrong.

While Rand occasionally refers to previous philosophers like Kant and Aristotle, the way she made use of their works made it clear that her understanding of them was cursory at best.