Joanna,
Isn't it interesting how reactions vary?! My daughter, like you, could watch Atonement again and again. For me once was enough.
This week I watched two movies that might leave others cold, but I think they're great:
The Sea Inside (Spanish film with Javier Bardem as a quadriplegic)
Iris (film that shows Iris Murdoch (played by Kate Winslett [young Iris] and Judy Dench [old Iris]) descending into senility. I could watch Judy Dench in anything. She's definitely my favorite working actor.