In his essay 'Nietzsche and fragmentary writing' in The Infinite Conversation Blanchot concurs with Heidegger's interpretation of Nietzsche's critique of metaphysics. He says:

"There is the work of critique: the critique of metaphysics, principally represented by Christian ideals but also present in all speculative philosophy. The contradictory affirmations are a moment of this critical work: Nietzsche attacks the adversary from several points of view at the same time, for plurality of viewpoint is precisely the principle that the adverse thought fails to recognize. Nietzsche, however, is not unaware that he is obliged to think from where he is, and obliged to speak on the basis of the discourse he is challenging."

What then is Nietzsche doing with his critique of metaphysics from within the philosophy institution? Blanchot, as is to be expected, is very vague. He says that:

"The Will to Power will therefore soemtimes be a principle of ontological explantion, saying the essence, the foundation of things, and at other times saying the exigency of all going beyond, and going beyond itself as an exigency. At times the Eternal Return is a cosmological truth, at times the expression of an ethical decision, and at other times the thought of being understood as becoming etc. These oppositions say a certain mulitple truth and the necessity of thinking the multiple if one wants to say what is true in accordance with value---but this multiplicitly is still in relation with the one, still a multiplied affirmation of One."

And it is simple. Nietzsche's critique of metaphysics is a moral critique involving the revaluation of values in a nihilistic world; one that then posits the humanization of the earth by yet to appear philosophers as the law givers and masters of the earth. The emphasis is on the human subject and the appeal to subjectivity.

As Heidegger points out Nietzsche remains firmly within the modern tradition of phislophy that has its roots in Descartes.