This wasn't what I was expecting, but it was much better; I was surprised by how much I liked it! The subject is serious, but it never gets heavy or gloomy--instead, the overall tone is light and frequently humorous. I love all the details. Also, there are many beautifully done lines that were very moving. After the first few chapters I got quite into it and had a hard time putting it down. (At first it was a little hard to follow, since Ruby's screenplays are often interspersed with the story.)
I was expecting it to be more focused on movies (which is why I started it); there are more than a few mentions of films and actors, and we do get to read parts of Ruby's screenplays, and the chapters often start with a screenplay-style opening (for example, "CUT TO the interior of her bedroom," etc.) But it wasn't as movie-focused as I'd expected. Not that that really matters, though.
Also, I don't think the jacket blurb does the book justice. I picked it up intending to, well, skim through it for the movie references, because the synopsis didn't sound that appealing. But it really did turn out to be very interesting, and I'm glad I read it!