I saw the play DOUBT on Broadway in '05, just before it won the best play Tony award. The film was, by and large, as thought-provoking and challenging as the stage play. The acting was superlative by all; Streep, Hoffman, and Amy Adams were superb, and Viola Davis as the mother of the altar boy was terrifically good! However, I thought the director (who also wrote it) made some odd directorial choices that pulled my attention away from the action of the film, and made me think about the choice, instead of the film. His writing might be better served by letting someone else direct his work.
Still, it's great stuff for those who don't want just action or pap when they go to see a film.