Saw it last night. It was good not great. Whatever dramatic power it has comes from parallels between what Nixon did and George W Bush's regime.
The behind-the-scenes of the interviews was fleshed out a great deal from the play. Certainly made the film more interesting. But still you could tell this was a theatre piece particularly in the last half hour.
Michael Sheen was good. The movie gave him more screen time and fleshed out his character. Langella was doing a number. I don't have a problem with that except he was over the top, the walk, the talk the jowles. way too much. From the supporting players only Kevin Bacon shines.