From what I recall of Postcards From the Edge, the preceding book, that story seemed more disjointed but it worked. Postcards the book is way different from the movie, there are characters who didn't make it to the screen, and Awful, while it flows faster (manic) sometimes feels like it's trying to hard.
Humor becomes more of a defense mechanism, and I get the impression Carrie/Suzanne tries too hard to use it. Everything becomes a pun when it doesn't has to. But there are some great stretches in this one - a spontaneous trip to Tijuana that turns scary, for example.
I do like this better than I did Carrie's last two memoirs, though. Surrender the Pink remains my top pick of hers