This isn't a bad book, it's just an incredibly unfocused book.
The first part of the book is the First Flight story, as advertised on the cover, art and all.
Then we get another story that feels like it would be much longer, but it's told without much art or even dialogue. This gives it feeling more like a history blurb than a story, and it's honestly not very interesting this way.
Then we get a guide to Dinotopia, but not the "current" version of the continent that we know and love, but rather a guide to the past version that the previous two stories takes place in.
The First Flight story would've made for a fine book on it's own, but at only 50 pages, it feels incredibly rushed. Also, it's obvious that Gurney has an incredible imagination, because normally a book would pick just robots, magic crystals, dinosaurs, or talking animals for the reader to suspend their disbelief with, but Gurney decides to use all of the above here, which can feel like more than a bit of a stretch. It all gets a bit much at times.
The second story, if it had been the focus of a whole book, seems like it would've made an even better story than "First Flight," but Gurney sadly decides to use little art or dialogue with it.
Finally, I would love an entire book dedicated to serving as a guide to all of Dinotopia, with details on known locations, species, characters, etc. Unfortunately it's relegated to the final third of this book and, again, feels rushed, covering little of the "current" Dinotopia and characters like Arthur Denison that we know and love, and inexplicably serves as a guide to the "ancient" Dinotopia that we just get a couple rushed stories for.
I would have loved an entire book (or all three!) dedicated to either of the stories or the guide, but all three in one is a missed opportunity.
Three stars because the art is still amazing.
Also, I have read the fourth book and, thankfully, things do pick back up again!