Am I the only one who thought Atonement...?

...was disappointing? The beginning was great, then it took a turn into the war and it lost me. It just felt like the director was more concerned with sweeping camera angles than he was in the story and the characters. Was it real or was it all Briony's imagination? I guess I should read the book to figure that out. James McAvoy was awesome as Robbie and the actresses were great, too, but this movie really fell short of what I expected. Who agrees?