I want to issue a warning to those who are interested in reading the first two books in this series also (especially the second book, Texas Bride) - I strongly advise you read the books in order. While you can follow the story without reading the earlier books, there is enough information given in this book about earlier books that some might feel it ruins the enjoyment if they try to read the books out of order -- again, especially if you try to read Texas Bride after reading Oregon Bride as there are quite a lot of spoilers given in this book about what happens in the second book. (Book one features the story of the parents of the hero of this book. Book two tells the story of the sister of the hero of this book, and because he is apparently involved a fair bit in the turmoils surrounding his sister and her man in book two, much of their troubles are touched upon in this book so that the reader is given a bit of background to understand the hero better). I have only read this book out of the series and had no trouble keeping up, so if you do not plan to read the earlier books in this series, you should be fine. And, of course, if you don't mind spoilers, feel free to read in whatever order you desire. ;)
As to this book itself, I enjoyed it overall. The situations that came up for the couple felt natural (for the most part). There were a few things that were not well researched (like saying a bite from a young rattlesnake is less dangerous than the bite of a mature snake), not well thought out (like the Crow braves who apparently can't track at all so just assume where the guilt lay) or just ridiculous (like people desperate for meat, but willing to leave a freshly killed oxen without a thought to the food it could provide). There were numerous situations like these in the books where I found myself wondering if the author really didn't understand the realities of the setting, or if she was just using excessive creative-license.
As a whole, I gave it 3 stars (since Goodreads has that as "liked it"). I'd read it again if enough time passed, but it is not a book I'm likely to suggest to friends unless someone specifically asks for "wagon train" romances.