I'm not going to rate this one because while it's not exactly a memoir it does bring together people sharing their own stories.
If you're looking for a book about current struggles and experiences of indigenous people in North America, you'll get a great overview with this collection. Sinclair never pretends to cover everything there is to cover and no one should expect that from a 320 pages book, that being said it's a very well documented book (beyond the stories) with a solid further reading section which also includes fiction titles.
I would absolutely recommend this book.