...and... little guidance... [to] fiscal policy in particular. So we should not have been surprised when many people turned to a model that had been developed to address precisely these types of questions, the Keynesian model, for guidance. Was this guidance useful?... The insights and advice... turned out to be remarkably good.... Modern macroeconomic models were not up to the task when they were needed the most, and nobody should be faulted for turning to the ‘old fashioned’ Keynesian model... for guidance...
http://www.thefiscaltimes.com/Columns/2015/03/24/Macro-Wars-Attack-Anti-Keynesians