Paul Karl Feyerabend is generally known as the philosopher of science against the idea of a unique scientific method, rationality and the view that science is a privileged form of knowledge. He proposed and defended epistemological anarchism and argued that, regarding scientific methodological rules, the only possible rule is anything goes. Since we consider this general image a simplification of Feyerabend´s epistemology, we intend to show that this philosopher was much more a critic of uniformity and a defender of diversity, when it comes to different forms of knowledge and worldviews, than an opponent of science per se. From this point of view, Feyerabend´s writings occupy a special standing in the rationality of science debate, since his approach goes beyond the irrationalist relativist positions that state the influence of irrational factors in the development of so called scientific knowledge. In this research, we shall emphasize those feyerabendian arguments that constitute an alert towards the lack of a critical attitude regarding scientific standards - Objectivity, Reason and Truth - as providers of a legitimate privilege of science in relation to other forms of knowledge. In addition, we shall also discuss the undesirable consequences of this lack of criticism not only within the philosophy of science but also for the development of scientific knowledge itself and, over all, for the accomplishment of individuality, of liberty and of the human potential.