Fair question: If I'm so critical of Austrian economics, why do I bother?
The answer: I respect the Austrians as adversaries. Even when they're dead wrong, they're intellectually stimulating, try to answer important questions, and write well. Though often misguided, the Austrians get me thinking, and hold my attention. And once in a while, they get things very right.
A corollary of my respect for the Austrians is my belief that their movement is wasting precious libertarian human capital. Perhaps half of all hard-core libertarian economists are Austrians. If I'm right that they're (largely) wrong, we libertarian economists are engaging the mainstream with one arm tied behind our backs. Strategically speaking, the purpose of my anti-Austrian writings is to convince them to reallocate their human capital in more productive directions. If I didn't think the Austrians had a lot of potential, I wouldn't be trying to convert them.
Austrians may take all this as a backhanded compliment. But it's actually the opposite.