It's definitely not worth buying. I say that as someone who had little choice of films on a recent long haul flight!!
Keira Knightley was Keira Knightley, if she wins an oscar I'll be as outraged as one can be about an award ceremony for a bunch of overpaid luvvies...
Visually, the film is lovely. Enjoyed performance of the elder sister Mary Bennet and thought Macfadyen was very good as Darcy (not wet at all, to my mind, as another poster said). Donald Sutherland wasn't much cop and Brenda Blethyn, whilst good, didn't match Alison Steadman for me.