From someone who typically avoids war themes, I was pleasantly surprised to pick up this book and like a lot of things in the book. The use of magic, myth, and "monsters" was well done, and everything felt real. I devoured the book like there was no tomorrow! The characters and plot were all good... the writing was captivating.
Ironically, I gave it a 3 vs. a 4 mainly because how Iris evolved by the ending did not feel suitable for someone who wrote articles from the safety of a city desk to moving to the frontlines trying to find the truth about the war. Her reaction to love and family was good and valid, BUT the execution didn't make sense or work for me. I have the same reaction as you to Iris' behavior and her change...but I liked the plot twist in the epilogue.
I will read the next book to see if I will be able to resolve why the Iris had to be this way...I am still rooting for Roman on how he will get them back together from the Gods who are separating them.