I found it hard to get into the book and to finish it (but I did).
Nevertheless, "I never promised you a rose garden" is a beautifully and evocatively written account of a young girl's stay in the asylum, and her struggle to overcome her demons, her mental illness (I specifically referred to "demons" as the world she imagines, the demonic universe of Yr, is haunting and disturbing and full of demons), and find a place within people, and in this world.
The book is a semi-autobiography of Joanne Greenberg, the author, and for many years was a bestseller in the States, and I can see why. Whilst the account of the mental illness might not be medically accurate, the language, the description, the narrative are all brilliant AND, what I loved, the story is full of sarcasm and self-humour, which makes the main heroine, Deborah, extremely likable. Just for the humour the book deserves another star. The structure of Deborah's alternate universe is mesmerising and absorbing, and I actually mentioned the book to the avid fantasy reader, because, in my opinion, one can easily enjoy the book as sci-fi, rather than a medical account.
I do not regret reading "I never promised you a rose garden", but I will be very careful in recommending this book. It's not for everybody. It's not for the majority.