Heidegger calls us to awaken from deep slumber of oblivion of Being and to realign ourselves with the 'Basic Question' which was raised by Aristotle but then it got covered over. His treatise on different thinkers was rigorous and showed How and Why the thinkers acquired such a Metaphysical orientation. But I think we can attack Metaphysics from one of its own 'tool', Objectivity.

Aim: What is the standard position of Metaphysics?? That consciousness 're-present' beings in their beingness, hence it affirms and presupposes present-at-hand nature of two entities, 'Cognizer' and 'Cognized'.

Metaphysics is not just one discipline but every other 'technical' discipline whether 'Neuroscience'/'Biology' etc, are Metaphysical at their foundation since to it the presupposition of standard is not even visible but it determines everything in advance. Because they operate with 'beings as beings' they think that they are free from any ground. Through it only we can attack metaphysics.

Method: We may take phenomenon of 'Sight' and interpret in analytically. Simple question would be, How is one able to see at all? Traditional biological answer(in a rough manner) is that light-rays strike the retina which then conveys information to the 'Subject'. But there arises an issue.

If we take a slow-motion video the light-rays corresponding to that reality too strike ones eyes, but that 'Temporal Unfolding' of event is invisble to perceiver, what more, the so called Subject is itself not present for that duration. Here we can put Objectivity to test,

Why is that duration, say 0 to 1 Second is slower than say 0 to 0.5 or even 0 to a trillionth part of 1?? Objectively there should be no such entity as 'fast' or 'slow'. Now this should not be confused with Einstenian notion of Time, there 1 sec on one frame and 1.5 second on other is 'equivalent', saying one 'faster' and other 'slower' are Metaphysical 'Value Predicates' which have no relation to Axiomatic structure of Theory of Relativity.

Hence, only way out is full reversal of interpretation of the essence of man. Subject itself becomes a temporal entity (different from ontological meaning of Being). 'Destruction of Metaphysics' could be carried out easily as we can see it fails to stand ground on its own objective standard, however difficult is 'Overcoming Metaphysics' as it requires radical transformation of the essence of language through which ones ownmost being becomes questionable as a consequence of interpretation of man as Da-sein, and for this it is only Heidegger who does that in an ontologically adequate manner.