I have never felt that Zizek is a particularly good writer, as good writers go: he doesn't have Lacan's gymnastics, Derrida's self-reflexive argument-as-content wizardry, Foucault's strategic reemployment of established words, and so on, and yet neither does his prose flow with the clear coherency and well rounded arguments of other marxist writers, like Jameson or Eagleton. And certainly this book does not break him out of that status.
That having been said, a number of his 'look at things from a different direction' insights are genuinely interesting, and one thing you can always, ALWAYS count on Zizek for is this: he has balls. Though his argument to get to the point is highly warbling and not particularly neat or convincing, when he states that emancipatory violence exists within the realm of love, you have to imagine Che Guevara smiling a bit in revolutionary heaven (it's not as well furnished as normal heaven, but there's more camaraderie). He will run, hell, he will CHARGE at your preconceptions, and he will show no quarter.
I would recommend reading this as part of a range of works on the subject of global violence and terrorism. It is too messy and rambling to give any coherent picture by itself, but together with his other work 'Welcome to the Desert of the Real', and such works as 'Philosophy in a Time of Terror' with Habermas and Derrida, 'Ground Zero' and 'Desert Screen' by Virilio, and such Baudrillard essays as 'The Violence of the Global' and 'The Spirit of Terrorism', it can give a good, interesting, and even (!) semi-coherent view of the world's more virulent mechanics.