This is the best film of a Shakespeare play that I have ever seen. (Throne of Blood is a great movie, but it's an adaptation, not really Shakespeare's Macbeth.) What makes the difference for me are the outstanding performances by the entire cast, not just Olivier. Maggie Smith's Desdemona is truly touching as a woman overwhelmed by fate. A young Derek Jacobi hits all the right notes as Michael Cassio: smart, loyal, eager to please, but a little immature. I haven't seen any other roles played by either Frank Finlay or Joyce Redman, but in any case, they're excellent here. I much prefer Olivier's Othello to his film role as Hamlet. That's because too many of Hamlet's lines were cut from that version. More text gives more characterization to Othello, and gives Olivier the chance to really fill the role, which he does beautifully. My only real complaint is that on the videotape, the widescreen picture is cropped too much. Everybody who is a fan of Shakespeare or any of the above mentioned actors should see this movie!
