So many people ripped on this book when it came out but I have found it amusing, but this last issue was downright laugh-out-loud hilarious. Allow me to walk you through the hilarity (Spoilers Ahead):

The first page makes fun at a mistake that was made in the second issue. An entire page was printed without speech bubbles or sound effects. Here, they provide a cut and paste page to add in the missing pieces, inviting you to be the DC Comics production department.

Then we get 3 pages of ripping on Dan DiDio (he had to have approved this so we see he has a sense of humor) ending with his death. I'm sure this delighted many, as he is far from the most popular DC employee at the moment. Further along in the book we see many references (all exaggerated and clearly poking fun at rampant fanboy rumor mills) as to how he died.

After that, there is Batman's Secret Space Prison for Embarassments From His Past which is ruled over by the 60s era campy TV show version of Dick Grayson as Robin, many, many funny refernces to the 52 storyline (Rip Hunter's chalkboard : instead of Time Is Broken, The Shipping Schedule is Broken), the villain dressing up as a girl to try and pick up a drunk Renee Montoya and last but not least the funniest parody of fanboy trivia knowledge that I have seen in a while

I understand that this book is not to everyone's liking. Giffen clearly enjoys poking fun at the culture of comic book geeks so you need to have a good sense of humor about this because, yeah, he's laughing at you.