I got the book, too. It's worth getting to take in the scope of the Zelda world, but it's a mixed experience for me.
Honestly, it's a lot different than what I expected. It largely focuses on the solely Nintendo-made games of Wind Waker and onward (up to Skyward Sword, which it really promotes in a big way). As an art book, it makes strange decisions of what it does and doesn't include, and what it highlights in bigger images. Some of the pinup work from Zelda 1 through Link's Awakening really deserves to be bigger than a couple of thumbnails big in size. A lot of great artwork from the games, particularly Minish Cap, are very much absent. As a history book, it's also surprisingly sparse and incomplete. It doesn't go into the development of each game in any level of detail similar to what was done in the Mega Man art books, and when it starts talking about character races/groups, they mention Subrosians but leave out the Tokays and Piratians. On the other hand, the tiny bits we get of unused locales and such, particularly for Majora's Mask, are very cool. The overall organization of the book feels a little scatter-brained to me. Really, besides promoting Skyward Sword, it feels the main thrust of this book is the timeline. It is a fascinating read, and some of it makes a lot of sense, but many times things feel like uncertain conjecture and not much different than a fan piecing together the series. All and all, it's an interesting read with a good overview of design work and production art, but it feels like a sampler compared to a definitive look at Zelda. I like that it gives you a sense of the series' scope, but I'm sad it doesn't highlight each entry in a more balanced manner. I get the impression it will impact newer fans of Zelda more so than older fans. One thought the book gave me was how much Wind Waker has affected the direction of the series' visuals. More games use that style than any other, it feels like. It must be said, though, that the production value of the book itself is as good as it gets.
As far as Zelda the series goes, it needs to start looking at Zelda 1 through Link's Awakening, becoming more open and balanced. The Medieval/Greco-Roman atmosphere of Zelda II would be really useful to look at, I think. I want the pure adventurer Link back, not the one who starts off as a farmer or a student or a train conductor. The series needs to cut to the chase of the adventuring more seamlessly, while introducing more unique items to find and implement across the lands. The Oracle games and The Minish Cap have been the best in this latter area with how fresh their mix of items has been.
I think that the Capcom games have been the best Zelda games post Majora's Mask, and have accounted for at least 85-90% of the series' positive innovations. Ironically, the recent DS entries, on the whole, have probably been more balanced than their console counterparts as of late. Even so, The Minish Cap is the last Zelda game I was completely satisfied with. It had some fitting twists and innovations on top of a good base.
It's hard to rank Zelda games, so I'll put them in tiers-->(I can't speak totally for the Four Swords games, as I haven't played them yet)
Tier 1: (The definitive titles)
The Adventure of Link
A Link to the Past
Link's Awakening
Ocarina of Time
Majora's Mask
Zelda 1
Tier 2: (Carry a strong legacy from the previous tier, balancing innovation with a classic adventure feel. Often underrated, and could conceivably challenge some of the above titles).
Oracle of Ages
Oracle of Seasons
The Minish Cap
Tier 3: (Solid games in their own right that come up short of the ideal).
Spirit Tracks
Phantom Hourglass
The Wind Waker
Twilight Princess
Skyward Sword