Pure theorizing versus applied research; positivist and non-positivist approaches in international relations; international relations is what the field says it is; the relevance of the international relations paradigms; a defense of methodological pluralism; and Marcus reads a quote from Kenneth Waltz several times

Further reading:

David A. Lake. 2011. “Why ‘isms’ Are Evil: Theory, Epistemology, and Academic Sects as Impediments to Understanding and Progress.” International Studies Quarterly 55(2): 465–480.

John J. Mearsheimer and Stephen M. Walt. 2013. “Leaving Theory Behind: Why Simplistic Hypothesis Testing is Bad for International Relations.” European Journal of International Relations 19(3): 427–457.