In short, as I felt the production’s blunt force more and more, I grasped its aura and aims less and less. “Othello,” unique among Shakespeare’s tragedies, is lean. (It’s even leaner in this production, thanks to some judicious cutting.) It has fewer major characters than most, and fewer sideshows. (Among the cuts: the annoying clown.) Its poetry is extraordinary. And though four principals die, all ultimately by Iago’s hand or influence, it does not tumble indiscriminately toward the blood bath. The deaths are specific and necessary to its themes. Leon’s “Othello” gets all that, except the themes. A good enough bargain, I suppose — or would be, except that center orchestra tickets are selling for $921. You could spend a lot less — or a lot more — to learn the sad truth “Othello” dramatizes: that those who choose to assume the best in people are most vulnerable to the worst. Innocence is ignorance, certainty a death wish. In a world (and on a stage) that loves not wisely but too well, Iago will always win.