Most folks have already enthusiastically praised "Witchfinder General" as a masterpiece, so I have little to add in agreement. It truly is a great film because it is about important ideas--a deep, dark, existential look into the worst of the human condition. John Coquillon's cinematography is about as good as it gets, and Michael Reeves's direction is superb. But what really sets this apart is Vincent Price's performance. It is easy to overplay villainy, lapsing into parody, but Price is so calm and unaffected here that he is the very essence of pure evil incarnate, an evil corruptly justified by misguided ideals. This is a powerful film, not only relevant as a historical depiction, but also as a morality play for events in the world today. It may be cliche to say, but you'll think about "Witchfinder General" for as long as you think about movies.
Review of Witchfinder General
