The book pretty much tells all you need to know about the process behind Rocksteady's amazing Batman: Arkham trilogy. Comments by creators showcase how the games and their ideas they came about from start to finish, and a great amount of art is included for good measure. Some of it has been revealed before, but there's quite a bit of never-before seen material as well.
That being said, I couldn't give the book the full five stars for two main reasons: keeping mum about Arkham Knight's full story and missing art. I would have hoped that the game developers and/or the author would be more forthcoming when discussing the final game's story and, more importantly, highlighting certain story decisions and designs when it comes to characters. The Red Hood, for instance, was marketed long before the release of the game, but isn't tackled here, while another more major player is missing as well. The book was released after the game and is meant to showcase its art and development, so reading it now makes it feel incomplete.
When it comes to the art, there is an unfortunate number of pieces missing from this book. Firstly, Carlos D'Anda created designs for most of Batman's rogues gallery for Arkham Asylum, and it's a real shame to have nothing more than his final interpretation of the main players included here.
Secondly, I would have preferred to have all advertising material showcased as well. There are a couple of images from Asylum missing, as well as some of Arkham City's great quasi-monochrome character posters, such as Two-Face and Mr Freeze (two of my favourites, as it happens). Most lacking of all is the third game's material, which is missing entirely. Including the character posters released in the run-up to the game's release, for instance, would have been a great way to showcase most characters' final design. Speaking of which, there's a worrying and distinct lack of Scarecrow, of all people. His redesign for Knight is brilliant, and featuring no comment or material on that front but including his henchmen seems like an enormous missed opportunity.
I'd still wholeheartedly recommend the book for Batman fans, superhero fans, fans of the games and aspiring video game creators and enthusiasts. As a a distillation of the process behind these brilliant games including art, it works well enough. With each game probably having enough material for its own book, however, readers who are not new to art books may feel that there's something missing.