I am fairly pleased with the end of the series. I accidentally picked up book five and somehow I forgot to pick up Captain's Fury. So I read 5 and was like, I don't remember any of this happening. So then I ran over to Borders and picked up First Lord at lunch two days ago to finish off the series. Now onto the fun.
Bernard and Amara continue to be the most boring people in that series. I could have done without them in the series. The Isana and Avaris relationship was interesting throughout especially once all the details came to light. Though I think most of us figured after book three that Tavi was more than was being shared at the time.
The relationship between Tavi and Kitai I thought was very well done and worth devoting more time to(which sadly, was never really done.) Especially her insistence at Tavi courting her because she was pregnant. The only downside of the series was the Vord. I didn't really care for them as antagonists and never could really get into them at all.
The Canim were a far better antagonist as far as I'm concerned. I also think Tavi asked Alera to give the other races furycrafting abilities. Making Varg a high lord was an interesting twist but as it was said up above, they are long lived and humans aren't. Eventually Tavi's work will probably end up being laid to waste as the Canim decide to rule the world etc.
All told, a very good series that I expected very little from when I picked up the first one. Butcher did a fantastic job stepping away from the Dresden/Chicago writings to give people something different. Sad to see that the series is over.