I preferred the Robert Redford incarnation - it seemed to capture the era better for me. I don't think that Carey Mulligan is hideous - just a little bland and innocuous - I don't think that she has the acting chops to carry a film. I have just re-watched this film and it seems to me that Wilson was too easily convinced that a man he had never seen before - whose car he didn't know - was having an affair with his wife - rather than a man he saw regularly. Add to this the fact that he witnessed her running out into the road screaming "Tom" (the man who had been driving the car earlier) and it gets even more implausible. I found the whole car exchange thing unlikely anyway. I also hated the wrong era music at the party which was just stupid.