This book is another high quality effort from Darwyn Cooke. It reminds me of the intelligent and mature tone of his previous effort, "Catwoman: Selina's Big Score" (which is also highly recommended by me).
"The New Frontier" is not as intense as "Selina's Big Score," but Frontier has a much larger all-encompassing story scope to cover.
Like "Selina's Big Score," Frontier is heavy on engrossing storyline, but light on costumed heroics, (Big Score had zero costumes, but cool street clothes). Frontier can go dozens and dozens of pages inbetween having conventional superhero scenes, in costumes. When the costume scenes do happen, (most notably in a great piece with the Flash!), then it is very entertaining.
Batman does some interesting sleuthing detective work, and though Wonder Woman and Superman are low on action, they are high on good character chemistry and tension. I especially enjoy the Darwyn Cooke version of an AMAZON-sized Wonder Woman who is taller than Superman.
What this book lacks in costumed action, it more than makes up for with heartfelt and sincere character development and motivation. There IS action in this book, but mostly involving characters in real world clothing and uniforms, not costumes.
This book is great for adult fans of the DC universe, who will enjoy all of the insider references, but young comic book readers may not comprehend the more subtle aspects of Darwyn Cooke's comic book writing for grownups, which occupies most of this book.
Me being more of a Marvel fan since childhood, I learned a few things about a few characters that I had not known about before, though, I think that is the whole point of this overall storyline, to fill in unknown gaps of what these superheroes were up to during the 1950's, before the Silver Age of comics began in the early 1960's.