Overall, I guess it is a suitable ending for the series, though at the same time it may also seem a little forced, especially after the series had dragged on at times in the past, and even in this book itself there's chapter five, which reads exactly like something written in order to just keep writing and buy time until more actual inspiration will strike. But even if it was a case of the author realizing, or being told, that she had to end it, at least in terms of the actual outcome she did a decent enough job. Less so in terms of how it came about though, as that was particularly disappointing, but I can't say more without spoilers. And speaking of what I can't say more about without spoilers, it was also unpleasant that one other decision, taken not long before the end, was just presented directly, without anything about how it was actually reached, not even after the fact if the author wanted to surprise the reader at first.
Otherwise, still some nice dragons, still nasty and downright dreadful humans, but sadly many unpleasant dragons as well, for various reasons, albeit through little fault of their own in plenty of cases. And no other relationships between a dragon and their captain or companion to save the day except that between Laurence and Temeraire, though the "chemistry" and understanding between those two remains a beacon of hope when it is given a chance to shine among the filth. And they do get the, if I may say so, sedate ending they appear do deserve... Albeit very briefly...