My opinion on this book is divided. The first half of the story is fast paced and full of character growth and engaging scenarios. The second half drops the ball almost immediately; it almost seems like a second writer took over.
The better half of the book has the protagonist and his surly friends leaving a large city for the forest and mountains where they frequently run into dangerous people or creatures, all while revealing major plot points. It's easy to read, engaging, and a good example of what great fantasy should be. This comes to an abrupt halt, however, when the author introduces a large scale military campaign. Stackpole spends an unreasonable amount of time giving the reader every detail of an upcoming conflict, small or large, then waits for another two chapters before he tells you what happens. These frequent breaks to describe strategy are far too long, and made me feel like scratching my eyes out; I put the book down several times in favor of other books, but eventually, I forced myself through it.
Another secondary, somewhat major flaw, was the character Alexia. She is perfect in almost every way, and frequently complains that her superiors aren't as strategically gifted as her. During the course of the book, she never fails at anything she attempts, and everyone heaps praise on her, feeding into her delusions of grandeur. In contrast, the main character, Will, is a complete ass that messes up routinely. While Will's attitude and lack of sympathy (and empathy) can grate on the nerves, he's far more realistic and relatable than the aforementioned Alexia. Resolute and Crow, on the other hand, are fantastic characters, and were most of what drew me into the story.
The totality of the story balances out to be just, "meh." The whole thing leaves me conflicted and I can't accurately say whether I liked it or not; the prequel novel, however, was very good, and if you read that and want to see loose ends tied up, you pretty much have to read Fortress Draconis (but you might not enjoy it).