With the lack of a strong story on its own, the central "difficulty in communicating with an alien race" theme begins to grate a little after 5 books.
It seems kind of extreme to say it of a 464 page book, but I think it could almost have been edited down to be the first chapter of the next book in the series. When I see this kind of thing, I always wonder if the publisher is applying pressure to squeeze out that last dollar.
Explorer, the next book in the series, is out now in hardback and my expectations are very high that Ms. Cherryh gets the series back to the level of quality we have come to expect.