The subject of the paper is a polemic between Leonard Nelson and Ernst Cassirer mainly concerning the understanding of the critical method in philosophy. Nelson refutes the accusation of psychologism and attacks the core of the philosophy of the Marburg School of Neo-Kantianism. In response to those allegations, Cassirer feels obliged to defend the position of his masters and performs this task brilliantly. The present paper considers similarities and differences in the positions of both sides in this debate. I try to evaluate the arguments of both sides and argue that they took basically the same positions, while the existing discrepancies did not justify such an intense polemic. If the disputing sides had approached the discussion in a less emotional way, it could have led to substantive and interesting conclusions.