For the record, I don't generally reread books that I didn't originally give five stars.
Every time I reread a good book it takes on a different meaning and gets better. This series is full of good books, because I never walk away from a reread thinking the book got worse. I'm not going to spoil anything, since this is a pretty epic book, and any little thing could destroy the first two books for you.
With this reread I really learned to appreciate Rowen more, and actually learned to appreciate Manon less. Why don't I like her as much anymore? Well, this comes from a writer perspective. I feel like it's a poor decision to insert such an important character into the third book. I think I'd rather read a spin-off about Manon, to be honest. While I still love her story (and it really reminds me or Eragon, one of my favorite books) it does feel out of place.
And why do I love Rowen more? Because I think, the first time I read it, I expected him to be another love interest. And while I totally agree he could be (and have seen many people shipping the two) I know, from the way the story ends, that it's probably not going to end up that way. So I was more comfortable reading about him and thinking, "Rowen's awesome!"
I also realized how many heart-wrenching scenes are in this book. Not that each of the books doesn't have heart-wrenching scenes, but this has the most. Celaena is torn apart so many times I have no idea how she even managed to put herself back together. It makes me love her even more.
Finally, the ending. I love-hate the ending. I hate it because my poor darling Dorian (my brother heard me hyperventilating over him and asked what was wrong and I started screaming about the King of Adarlan and he just walked away real sad for me). I love it because it elicits such a strong reaction from me in the first place. If a book can make me feel the feels then it deserves all the love in the world. (That's one of the reasons I enjoy sad stories so much). I've replayed the ending many times in my head but never reread it before. And it's more heart destroying than I remembered. I broke into even more parts than I had before.
So, yes, I loved the book as much as I did the first time, though in many different ways.