I'm not going to debate if life was "bad enough" for a fictional character. I can think of a dozen ways to write it to make it worse. There are events that separate a person from the rest of humanity. Scars so deep they prevent us from ever being like everyone else. This book discusses three of them with an emotional abandon rarely braved.
The book has inevitable spiritual and scientific debates. I've been drawn into heated debates about euthanasia and the appropriate or acceptable amounts of medically scientific interference that should be permitted for two decades now. This review of a fictional book is not going to contain my encyclopedia-worth of knowledge on the topics. The book is fiction. Besides, the book seems to have covered every angle of those debates. One of the primary characters is diverse only in the sense that he has a severe medical condition. I found other minor characters in the story who had similar afflictions to Will, but who lived very different lives than he did.
I would like to remind everyone not to feed bread to ducks. Seeds and lettuce in moderation are okay.