""United 93" winds up feeling like a cross between a motion picture and 90 minutes of therapy — the kind of movie we should see, in that civic obligation sort of way, rather than the kind we might actually enjoy. There’s not a lot to learn from this story; every last person in the audience knows exactly what is going to happen. The movie meanders back and forth across the line separating documentary reenactment from full-blown drama, never quite committing either way. But there’s a grit — a vicious, real-time tension — that serves to heighten rather than undermine the crescendo. Virtually every scene is hewed to a sharp and frightening simplicity, blissfully free of the usual cinematic bloviations."