I think this book suffers from a bit of an identity crises. Is it a book about pirates based on fact, with stories about real pirates? Is it a commentary on the Disney Pirates of the Caribbean franchise, including the movies (but not the thrid, because it hadn't been released at the time the book was written), park rides and where to buy the best memoribilia? Or is it a travel book, telling us where to visit actual pirate hangouts and where to see the best pirate reenactments and boat restorations??
The answer is that it is all of those things, and a little bit more. A bit of everything-but-the-kitchen-sink look at "pirates". I wouldn't say that this is a bad thing, necessarily. It just might not be what you're looking for. There's enough variety to make it interesting to kids and adults alike.