Having said that I didn't know what to expect, I have to admit I really enjoyed it. I can honestly say that this is the first time I've just sat read an entire book from beginning to end in one sitting. It's not that I don't read either, I typically read 25 to 50 books a year.
The book itself isn't written in long form prose, rather it's articles, speeches, lectures and opinion pieces(?) she's written over the years. These focus on a variety of different areas, like book reviews, cinema, political oratory, and family history.
The order of the stories is somewhat weird (though you can change that by just dibbing in and reading a chapter you fancy), and I'm not sure I'd've started with a review of "Their Eyes Were Turned To God" for example, but having read it I can see why she did, as it gives you a feel for what the author was like growing up.
So, in short, it's a good book. If I had one criticism, it would be her piece on the author David Foster Wallace. It was interesting, and I can see why she wrote it, but smacked a little of being a "love in" by an awe-struck fan.