I read this in less than 24hr. At times I found Jack's "voice" to be obnoxious, irritating and so far removed from the voice of my own 5yo (albeit she hasnt lived in her life in a 11x11 room) that I really struggled. On the other hand Jack's observations of the outside world were at times tear jerking in their innocence and at others wise beyond his years. I can see readers will either love this or hate it. I felt both at various points in the story. Despite the irritations with the almost gimicky style and the lack of depth with regard to life post-Room (one of the pitfalls of having a child narrator) I have rated it 4/5 simply because, regardless of what I think of the writing, Ma and Jack will stay with me for a long time.