I agree that the plot and presentation are flawed, however, there is value in seeing how some people perceived certain social situations during an earlier era in our history. Not all people at that time, of course, saw things the same way, nor would they have made the movie in the way that it was done, but I appreciate all the old films because each gives us a short look at things through other eyes.
As for the complaint that the NAACP would not like the film, I am not sure about that. Maybe they would see some value in the enhanced exposure of certain attitudes, maybe not.
Having grown up in Louisiana, I do think that the voodoo scenes were overdone and the man wrestling with an already dead alligator was pretty hokey, but I was pleased to see some clear water for a change. (I suspect that scene may have been filmed in Florida because by the 1930's we had pretty much ruined our bayous already.)
Mike