Before I started this my co-worker said something along the lines of "I'm don't remember a bit of the plot, but I do remember the world."
I found this to be totally true. I really loved the visuals of the universe, but there were a few times where I was confused as to what the characters were actually doing. Not confused because the action was really fast-paced, but more like it so languidly written, I couldn't remember where we'd last left characters and if we should be concerned for them or not?
But I'll read a few more of Gibson's books, and I can definitely see how so many are eager for a movie.