Well-executed movie presenting one, and only one, side of the story. "Truth" is a film much in the ballpark as "Argo" - cinematically excellent but factually questionable. The script is smart, the film proceeds at a rapid clip, and the performances, especially that of Cate Blanchett as Mary Mapes, are excellent. It's worth watching. It's also worth, however, realizing that this film is based on Mapes' own book on the disastrous 60 Minutes II "expose" questioning George W. Bush's National Guard service in the early 1970s, which quickly lost credibility shortly after its airing weeks before the 2004 election.
There is no law requiring that movies or documentaries be fair, accurate or reflect all sides' recollection of events, and this movie is clearly sympathetic to Mapes, Dan Rather, and the other staffers at CBS that rushed the piece into production despite the shakiness of both human and document sources. Network executives, as is usually the case in such films (think "The Post" and "Kill the Messenger") are depicted as spineless in the face of attacks on the network's staff by Republicans and other networks. Those real-life individuals have blasted the movie's depiction of events but, alas, a film based on their perspective wouldn't fit the normal Hollywood narrative concerning the idealization of "plucky, brave, intrepid reporters only seeking the truth in the face of partisan and corporate pressure." What's peculiar about this movie is the near-godlike depiction of Rather by Robert Redford. Whether such marbleizing of a veteran but VERY flawed journalist was driven by Redford's own ego or infatuation by the actor, producer and/or director is a mystery.
An unstated, and unanswered, question hovering over this movie is whether CBS's personnel (or those of any other mainstream news organization) pursued this story with such doggedness over five years had it been a Democratic candidate or president, especially a progressive one. Enjoy the film, but don't expect tough questions like this one to be addressed anytime soon.