I just caught this on a flight out west from Toronto.
I was not sure what to expect, I had read this thread, and it was the only movie that I had not yet seen.
I liked the performances of all.
Downey - While I agree that some of the Iron Man smugness was there, I felt he did a decent job isolating that character from a related one in this flick. He certainly was easy to dislike initially! Loved the high school photo in the year book - totally reminded me of his Less Than Zero character!
Farmiga - loved her in Up in the Air, and I felt she played her role in this one well too.
Duvall - well done, as I would expect of an actor of his caliber.
Thornton - I am not always a fan, but I loved how he countered some of the smugness of Downey in certain scenes. He played his role well here too.
Shepard. Yes, Dax Shepard - I don't recall EVER seeing him in a non comedy role, or at least one I could only take as comedy. He was good as a local lawyer who seemed out of place in the heat of the main portion of the story. Believable.
7/10 overall from me, though Rotten Tomatoes is panning this flick.