Chock-full of dragony goodness. This book is right up there with the Draconomicon. The book is heavy on dragon anatomy, psychology, etc. and very light on sample dragons and stat blocks, and there are ZERO lairs. I'm a little rusty on....3.5e? so its hard to tell how balanced draconic races like the Draconians are.
D&D has been making slow, slow progress away from things like racial modifiers (especially negative ones) and alignment requirements. Krynn, on the other hand, has always leaned hard into them, and is more on the cartoony side of high fantasy. Villains are uniformly evil for evil's sake, good guys are all good to a fault. The sheer variety of dragon beasties presented is staggering, but in the end they neatly line up like teams in a football game.
That being said, I wanted to read about dragons and this delivered. I'd love to play an all-draconian campaign one day, but that is literally the only campaign I'd ever want to play in this setting.