This ended up being a pretty long piece so, for the "tl;dr" people, here is a quick summary:
We are experiencing deep economic problems and it is the fault of the economics discipline. Their macro theories suck. But, there is no mechanism forcing it to alter its models when they don’t appear to work. This is so because economists basically write for each other in a language only they understand and their jobs depend on impressing a limited number of journal editors and referees, not correcting real-world problems. The academic inbreeding that has resulted has led to dysfunctional theories and, despite the fact that there were economists who accurately forecast the Financial Crisis, because their work is incompatible with what is published in “good” journals it has been all but ignored. Economics is broken and there is no internal incentive to fix it.
The global financial crisis has revealed the need to rethink fundamentally how systems are regulated. It has also made clear a systemic failure of the economics profession. Over the past three decades, economists have largely developed and come to rely on models that disregard key factors—including heterogeneity of decision rules, revisions of forecasting strategies, and changes in the social context—that drive outcomes in asset and other markets. It is obvious, even to the casual observer that these models fail to account for the actual evolution of the real-world economy. Moreover, the current academic agenda has largely crowded out research on the inherent causes of financial crises. There has also been little exploration of early indicators of system crisis and potential ways to prevent this malady from developing. In fact, if one browses through the academic macroeconomics and finance literature, “systemic crisis” appears like an otherworldly event that is absent from economic models. Most models, by design, offer no immediate handle on how to think about or deal with this recurring phenomenon. In our hour of greatest need, societies around the world are left to grope in the dark without a theory. That, to us, is a systemic failure of the economics profession (Colander, David, Hans Föllmer, Armin Haas, Michael D. Goldberg, Katarina Juselius, Alan Kirman, Thomas Lux, and Birgitte Sloth. "The financial crisis and the systemic failure of academic economics." Univ. of Copenhagen Dept. of Economics Discussion Paper 09-03, 2009 p.2).