Winterbirth is an interesting and fascinating debut fantasy book. It's not a perfect fantasy book, but it's much better than certain new books.
In my opinion Winterbirth has potential, so it's interesting to see how Brian Ruckley manages to develop as a writer. I'm looking forward to reading his next book.
If you like good adult fantasy stories, Winterbirth will probably be of interest to you. Brian Ruckley can't be compared to George R.R. Martin, but fans of A Song of Ice and Fire might like this book.