Well that was a disappointing end. After such a long descriptive narration of every aspect of the story, the story's end is just a footnote in the epilogue? Ugh...
As a trilogy, there's good and there's bad. I found the universe-building to be great. The technology and science, distinctions between humans who have become their own species based on the planets they came from, and the space-dwelling humans are all well thought out, and expanded upon.
As for the bad, I think the books are way too long, too descriptive at times with actions and storylines that don't matter in the end. Reynolds could have easily cut down his books by about 100-200 pages if he wanted, without losing anything of importance.
Some people say: "It's the journey that matters, not the destination". True for the most part, but that god awful ending left a bitter taste in my mouth. Like Game of Thrones Season 8. Sure the series was good, but the last episodes ruined the whole thing, and I'd never go back and rewatch, knowing the ending.