There are many reasons to read Nietzsche. Whether you agree with his substantive views, taking him seriously will help to keep you intellectually honest. An example comes from Beyond Good and Evil, Part One: On the Prejudices of Philosophers, §5:
What provokes one to look at all philosophers half suspiciously, half mockingly, is not that one discovers again and again how innocent they are – how often and how easily they make mistakes and go astray; in short, their childishness and childlikeness – but that they are not honest enough in their work, although they make a lot of virtuous noise when the problem of truthfulness is touched even remotely. They all pose as if they had discovered and reached their real opinions through the self-development of a cold, pure, divinely unconcerned dialectic (as opposed to the mystics of every rank, who are more honest and doltish – and talk of “inspiration”); while at bottom it is an assumption, a hunch, indeed a kind of “inspiration” – most often a desire of the heart that has been filtered and made abstract – that they defend with reasons they have sought after the fact. They are all advocates who resent that name, and for the most part even wily spokesmen for their prejudices which they baptize “truths” – and very far from having the courage of the conscience that admits this, precisely this, to itself; very far from having the good taste of the courage which also lets this be known, whether to warn an enemy or friend, or, from exuberance, to mock itself.
According to an interesting website authored by Hugo Mercier, “Current philosophy and psychology are dominated by what can be called a classical, or ‘Cartesian’ view of reasoning. Even though this view goes back at least to some classical Greek philosophers, its most famous exposition is probably in Descartes.” This essay is Part I in a critical assessment of Mercier’s claims as outlined on the above website. Mercier contrasts the Cartesian view discussed with a dialogical view of reasoning that is supposed to fit best with empirical evidence and our evolutionary heritage. I will address it in more detail in Part II. All quotes below are from Mercier’s website. I question some of the claims as I quote them. Those objections are in brackets. I then go into a more detailed and general critique of the claims.