I don't know the last time I have loved two main characters as much as these two. Everything that happened to them devastated me. Doerr knows how to write the human heart - our fear, our survival, and our love. I was moved by this book and angry at Netflix for missing out some incredible characters (especially Frederick) when I watched it after this read-through. 
There were small elements of the writing style that I didn't like. Some of the more emotive language felt unnecessarily complex. Nonetheless, it would be a crime to rate this story any lower. I loved it.