The man who insisted that Western philosophy was based in confusion and wishful thinking is not a popular one among philosophers. But he should not be dismissed.
The singular achievement of the controversial early 20th century philosopher Ludwig Wittgenstein was to have discerned the true nature of Western philosophy — what is special about its problems, where they come from, how they should and should not be addressed, and what can and cannot be accomplished by grappling with them. The uniquely insightful answers provided to these meta-questions are what give his treatments of specific issues within the subject — concerning language, experience, knowledge, mathematics, art and religion among them — a power of illumination that cannot be found in the work of others.
Admittedly, few would agree with this rosy assessment — certainly not many professional philosophers. Apart from a small and ignored clique of hard-core supporters the usual view these days is that his writing is self-indulgently obscure and that behind the catchy slogans there is little of intellectual value. But this dismissal disguises what is pretty clearly the real cause of Wittgenstein’s unpopularity within departments of philosophy: namely, his thoroughgoing rejection of the subject as traditionally and currently practiced; his insistence that it can’t give us the kind of knowledge generally regarded as its raison d’être.
Wittgenstein claims that there are no realms of phenomena whose study is the special business of a philosopher, and about which he or she should devise profound a priori theories and sophisticated supporting arguments. There are no startling discoveries to be made of facts, not open to the methods of science, yet accessible “from the armchair” through some blend of intuition, pure reason and conceptual analysis. Indeed the whole idea of a subject that could yield such results is based on confusion and wishful thinking.