It has some scenes (like that one, and rather delightful descriptions of Aubrey and Maturin bringing their families out to sea) that make me glad I read it. But it does have a sense of being not merely incomplete but unpolished. The prose is just not really in finished version, or what one expects of O'Brian.
I have read many, many stories by dead authors, but for some reading this book and even the previous finished one made me melancholy for O'Brian's passing. I don't know why. Perhaps because, as alltoseek says, it reads like one long story and I never do have a sense of "okay, this is where it ends".
It's okay that 21 stops in the middle, though. I often felt like these books did. They were true to life in that respect: no points where everything wraps up neatly and nothing new has started. There was always something more.
I'll give this one a 6. Overall, I'm happy to have read this series, and sorry it's over. But maybe now I'll get back to doing the group read on Dreamwidth. They're up to Desolation Island now!