I always loved the Dragon-Blooded the most. THEY are the coolest Exalts. Because they are relatively weak and have to budget their powers. Because they get their power from Gaia. Because their powers are related to the elements (which makes for cool special effects). And because they are team players.
Okay, now, this book. From a fluff perspective it is definitely great. It goes into depth about a piece of Creation you will hardly get around when playing Exalted: the Realm of the Terrestrial Exalted. Either you are a proud subject of the Scarlet Empress or one for her many enemies!
You also get a lot of context for Dragon-Blooded of the Realm, but also for Outcastes, "Lost Eggs", the Terrestrials of Lookshy with a great deal of extra information.
And of course you get al the rules you need to play one of the Dragon-Blooded, be it Dynasts of the Realm or Outcaste characters.
I have to say that I really love their charms, they are flavorful, powerful, but a little flawed compared to the ones of the other Exalts (that's on purpose, mind you).
Now, unfortunately the charms are not only flawed on purpose. There are also many inconsistencies, oversights and unclear descriptions in the list of charms. Luckily, these get remedied with the free supplement "Scroll of Errata", but actually a book shouldn't have that many rules issues.
Additionally - as Dragon-Blooded to written pretty much in parallel to the 2nd Edition core book, the writers didn't take most of the social combat rules into account when defining charms for the Terrestrial Exalted. This IS a weakness.
The Good: Comprehensive tome on my favorite Exalts. Great background and fluff. Great, flavorful elemental aspects and charms. Even if you don't want to play Dragon-Bloods yourselves, these are your most obvious enemies.
The Bad: The charms seem to be put together pretty hastily. You definitely need the Scroll of Errata. With that document, the DB are clearly playable (and a lot of fun at that).
Resolution: Despite its flaws I like this book the best of all Manuals of Exalted Power. If you're playing in Creation (an why would you play Exalted if you didn't want to) this book is a must-have for Storytellers as it describes the most numerous Exalts and the most powerful political entity in the whole of Creation: the Realm.
[4 of 5 Stars!]