So I finished "The Night Angel" trilogy, and a few words that spring to mind are underwhelming, anticlimactic, ass pull, talentless hack.
The first in the trilogy was a very interesting read. It had a very atypical protagonist and a dozen atypical supporting characters. About the only character with an analogue in the "average" fantasy book was the token religious zealot, and even he had his character development. It was magic-lite, character driven and I'd call it... not a favourite, but one I'll certainly go back to in the future.
Then we have the second and third novels, which got worse as they progressed. In Two, a minor character turned viewpoint character is reduced to your average kuudere, magic plays a larger role and the interesting character conflicts become a bog-standard war-against-evil-empire in which the protagonist forgets he's an amoral assassin and moves in with his morality pet girlfriend, finds he can't ignore the call to heroism and becomes your typical naive, boring invincible hero (literally. Upon death, he gets better. That's a plot point, and could have been fairly interesting if it wasn't largely treated as a way for the character to survive the various challenges - get killed, have body dumped somewhere, wake up good as new.
In Three, it's taken a step further: the various plot points set up in One and Two (the seeking of various macguffins, various prophecies [sigh] unfolding and various new ones pulled from nowhere. Three is a shitstorm of far too much going on in one book, and the author hasn't the talent or skill to do that well. About a dozen factions all have their plots and intrigue, none of which do anything more than provide a potential threat the protagonists have to take into account. For example, a fairly large chunk of the book is about one of the macguffins I mentioned earlier falling into the hands of a Proud Warrior Race guy and what he does with it. It doesn't further the story at all, and serves only as a vehicle for the author to write prophecy into his story and attempt to look clever by going LOOK LOOK SELF FULFILLING PROPHECY, trying to make it look intelligent in the manner of The Matrix.
In Three especially, shit gets way too reliant on the "a wizard did it" mentality: the protagonists' mentor who succumbed to Mentor Occupational Hazard in book one comes back, despite having given away his source of immortality. The final Big Bad is defeated by a Chekhov's Gun set up about ten pages earlier. It turns out the sword of the protagonist is also an ancient artifact of magic. It combines with the macguffin introduced far sooner to enable a group to bring balance to the Force, or some such shit. By that point I was too relieved by the ending being in sight to pay it much heed.
While book one is great, two and three have very little to offer. In Three, there's some time given to a formerly minor character taking over his father's empire and his slow descent into evil, which was interesting, but beyond that I can't think of a redeeming point. Basically, don't read them.