This is a somewhat vague statement but I'm assuming you're referring to the Austrians' "a priori" approach to economics.
> nor respected in the wider economic sphere.
Given the adversarial stance that the Austrians take toward government intervention in the economy it is no surprise that their ideas are not endorsed by academics.
Individuals should make their own judgement about the persuasiveness of the Austrian arguments and not dismiss them because they are unpopular.
If you have the time, I'd welcome a critique of any argument contained in that Hazlitt book quoted above.