There are aspects of the South that this film captures that I've rarely seen expressed so clearly and accurately on film. The odd inferiority complex, which is the most prominent and elusive, the commitment to religion, the familial devotion, the silent father, the nosey neighbor, the verdant landscape, the meddling mother, the racist, loyal Confederate artist -- all of it is here and expressed in all its honorable integrity and ridiculousness. The film is an achievement on the level of Faulkner in this way, but it obviously lacks in others.
Amy Adams's break-through performance is the film's highlight, and Adams is both charming and annoying. Her work embodies the film's embrasure of contradictions, which is why she fits so well with the rest of the strong ensemble.
I think the film didn't fully get at the root of the family's dysfunction, as Super Reviewer Alice Shen pointed out, but I also think the film was caught betwixt and between on whether or not to judge these characters.
Overall, Junebug is a fantastic addition to film's attempt to capture the South.