An absolutely brilliant book. Maybe one has to have wrestled with Žižek for a while to appreciate how truly great it is. No doubt there are gaps in Kotsko's explanation but none is nearly as great as something Žižek would have left behind without Kotsko.
That said, I still don't quite understand why Žižek's theological turn was necessary, which is a point Kotsko does not tire of repeating. Kotsko says that the theological turn coincided with and was triggered by his reading of Badiou and what struck him in Badiou was "truth". Yet, Kotsko portrays Žižek's relationship to Badiou's book on the Apostle Paul in negative terms. Kotsko summarizes by juxtaposing Badiou's "theology of glory" with Žižek's "theology of the cross".
Kotsko seems to suggest Badiou is too much of a system-builder and invests the system with too much truth or at least credibility while for Žižek the radical subjectivity of the Cartesian doubt is the ultimate truth. I doubt very much that is the correct way of portraying Badiou, whose magnum opus Being and Event is modelled after Cartesian meditations and animated by Cartesian doubt. The systems that Badiou may build are permeated by nothingness, which is the same ultimate horizon that Žižek uses as his baseline. For Badiou, fullness is, simply put, empty.
Maybe my inability to follow Kotsko here accounts for my losing the thread. However, Kotsko does so many things right as to make that bit almost negligible. Kotsko's book is a good summary of Žižek's theological turn and, since the theological turn is presented as something that was necessary for Žižek's philosophy, it is also a good summary of his thought in general. It is nice to see that Žižek's trajectory resembles mine so much, which made the book so perfectly relatable for me.