The four stars are for the strength and importance of the core argument. Namely, too many people thinking about Blackness are too content simply describing Black oppression and not nearly interested enough in thinking about the liberatory potential of Blackness itself. This is because (and this is where the science comes in) too many people are still, unwittingly are not, wedded to biological notions of what race is. Even as people dutifully parrot that race is a social construct, they still see it as something constructed in a fundamentally biological way. Put differently, *somehow* the same people that were Black when we were measuring skulls with calipers are still Black now that we *claim* to have left that behind for a social constructivist view of race. It's time to actually let go of biology (and afro-pessimism) and start thinking about Black liberation and the overturning of a biocenteic order that insists on white supremacy and Black inferiority.
The one missing star is because that's basically it. The book gets to its point right away and then is just content to repeat itself and play with form. I appreciate experimentation, especially in academic writing which can get dull, but the experimentation here fails, in my opinion (which is okay, if an experiment's success was pre-determined it wouldn't be much of an experiment). McKittrick is a good Black feminist (although she disavows feminism in the book because it's roots are too white) and so is generous and detailed with her citations. But perhaps too much so. There is one chapter which is basically just a summary of her mentor Sylvia Wynter's Black Metamorphosis and another chapter that is like a remixed Encyclopedia entry where I think (?) all of it is just quotes/paraphrases of other people. My thought is, if I want to read other people, I'll read them myself, just point them out to me. I picked your book up to read you.
I would highly recommend this book, I'm tempted to say to anyone, but realistically it's probably too steeped in academic discourse for a lay person to care about most of it. But I do think the central argument is an important one for everyone is this world where the liberal position has become "believe science" without a reckoning of what science is. Which is not to say that science is bad or wrong, but that science is incomplete, can't account for many of the things that are important to living meaningful lives, and has a long racist history that extends into our present moment. And if that's all you take away from the book, that's enough.