As a collection of letters that were never intended to be published by the author, but rather simply personal letters to his wife, there is no real room for criticism. As the testament of a man living under the most disquieting of circumstances and his attempt to respond coherently to the moral, spiritual, and political bankruptcy surrounding him, they are without peer. His obvious love for his country and his desire to find a way through the mess for all of them calls -- indeed, demands -- any who sense a similar decline in their own culture to similar sacrifice and service. And this most notably came at a price: years spent mostly away from his family and his beloved home, months in prison, and ultimately his execution.
That said, this book is probably better paired with a good biography of Moltke; one could wish for even more insight into his actions and endeavors with the Kreisau Circle, which may make the book even more challenging and insightful into how one could respond to the degradation of one's own culture and nation.