'Doubt' is a movie rife with stunningly skilled actors demonstrating their prowess (Phillip Seymour Hoffman, Amy Adams, Meryl Streep), and is a strong film, but is ultimately unable to distinguish itself from its theater source; it is merely a play on film, rather than on stage. You almost expect a curtain to draw over the last scene, only to open to the main trio taking a bow, accepting bouquets.
It is worth seeing, but the film will never be remembered as a separate entity from the play.
Amy Adams makes for an adorable nun. Does not everyone have a little crush on her?