I can't speak to either the movie or the book, but I've found it interesting that whenever I see a movie before reading the source, I'm pretty happy with the movie, but rarely am I satisfied with the movie when I've read the book first.
The subtle nuances and key moments that I love are rarely translated to the screen. It's perfectly understandable, because they're two very different forms of fiction and the movie rarely has time to be much more than the Cliff's Notes version, but it's still disappointing.
When I've seen the movie first, I can appreciate it for its own sake.