The core story of this series so far is great: creative and interesting with good characters. The world feels complex and large, with many interwoven realms, cities, associations, and sects.
The editing is terrible and sometimes reads as a first draft. Also, although the author does a good job weaving together different points of view, it can get excessive and feels choppy. It reduces the reader's ability to understand and identify with the characters, as well, no matter how deep the characters are.
The worst parts are all the interminable and detailed walls of text that feel like a dry textbook for a fictional magic world or the military. I skip these sections freely, but I think the books would be better if a lot of that were put in footnotes or appendices. Some people must like such details, but they bore me silly, making the story drag and feel repetitive. Much of it could be condensed, as well, which a good editor could help with.
For example, The Lord of the Rings has extensive appendices for people who like the details and Tolkien doesn't put it all in the middle of the story to kill its momentum.