I just finished "First As Tragedy Then As Farce", and I'm a little disappointed. The book is full of pointing out contradictions and problems, suggesting interpretations, and criticizing everything left and right. While I found the writing style hard to follow and had lots of problems with the arguments, the main frustration was that he doesn't attempt to build anything up. You wrote that I "criticise Zizek for not giving any alternatives to (cultural) capitalism, and yet he clearly has never been in the same room as a Zizek book", but even now that I've read this book through I would make the same criticism. The closest he gets is saying that we need to make a fresh go of communism, from the beginning, but there's nothing about why we should expect better results this time or how we should go about it.