There are a lot of published books about mental illness or about topics that apply to mental illness. Most of the different types are memoirs, self-help or psychology. Some are brilliant. Others are absolutely awful. If you're browsing around in a bookstore, and read the back of some books, they might not seem to have much to do with mental illness... if you have read some books like this, everyone who finds their way onto this site would appreciate it.
If you hate a book, say so. If you couldn't get past the first forty pages, say so. If you learned a lot, or found the kind of wisdom in a book that hit home for you, definitely say so.