Some may be crackpots, but the list includes Nobel laureates (Gary Becker, Robert Lucas, Thomas Sargent) as well as other highly esteemed researchers (Robert Barro, John Cochrane, Eugene Fama, Greg Mankiw).
You might think the views of Greg Mankiw, RobertBarro, Scott Sumner, or George Selgin are wrong, but at least they understand standard macroeconomic concepts and have a coherent story about why they favor alternative models.