In my opinion, this is where the series started to go sideways. What had been a giant scale tale of political and bureaucratic intrigue, with the personalities and local dramas illuminating the larger picture, became both more personal and more shoot-em-up. From comments over the years on science fiction discussion sites, most readers didn't like the later volumes as much. Reasonable folks can differ as to how much of the unfavorable reaction was because of an actual drop in quality and how much was simply that many ardent fans of the early volumes [including myself:] simply weren't as enamored of the style and genre of the later ones. It is sorta like getting to volume three of the Foundation series and finding a Lucky Starr novel; or perhaps a sequel to Advise and Consent that reads like one of the Jason Bourne tales. In each case the later novels might be as good and appeal to as many people, but they won't generally be the Same people, and the reviews from fans of the original series will reflect that.
Of course, for me personally, a puzzling change in this book is the fact that in a series replete with go references, this book has only one, a brief note on page 177 [of the US paperback edition:].