Firstly, I found this book very easy to read, considering that it is a translation from German, so good marks on that front.
This book is part memoir, part history and part political statement. Scheer's first hand account of his naval progression throughout the war is thoroughly enjoyable. It is good to have a background knowledge on the history of naval warfare in the Great War, but also not essential.
This books one failing, although understandable, is Scheer's to get bogged down in politics and in laying blame for events or using them as justifications for the German navies actions. Particularly unrestricted submarine warfare.
However, as history is nearly always portrayed by the victors, it is valuable to have these views as propaganda and Misinformation are prevalent on all sides. It is only by understanding all aspects of a story that we can hope to reconstructed a closer representation of the facts.