This book is not intended to be an identification guide. It is intended to tell people where to go to find birds. For an identification guide to Hawaiian birds, I recommend "A Photographic Guide to the Birds of Hawai'i: The Main Islands and Offshore" Waters, by Jim Denny. Although there are cheaper, more compact guides, I found Denny's to be easier to use.
It is unfair to rate a book down for not being something it never claimed to be.