My only substantive criticism of this book is its reluctance to define its audience, and correspondingly, using a title that misrepresents its content.
This is a book for a party that has former hands-on experience with a similar technology (e.g., X.500, NDS, LDAP) and needs to manage a Microsoft implementation. Or for a hands-on technician who is new to the technology in general.
The author is a former Novell employee and this is the third version of the book, so readers can expect some broad insights and no vendor bigotry. In many sections, one can tell that "Server 2003" was added to the text via "search and replace", but it matters little, and Server 2003 was directly addressed in areas where it matters (i.e., global catalog servers, etc.).
Architects and implementers should pass on this one, but managers and consultants should pick it up.