I disagree - I thought the last ten minutes were very powerful and well acted. The cliff hanger is more cerebral and nuanced than in the past, sure, but we are still left wondering - where will Jack go, what will he do? I don’t think it’s any less of an ending than when he walks down the tracks into the sunset at the end of season Day4. (it was Day4 right?)
I agree with you. It was a superb scene between Secretary Heller and Jack, showing Jack's rage and grief. And when he leaves the house and stands on the cliff, his exhaustion and strain and despair were powerfully portrayed. He was a man who'd reached the end of his endurance, so stunned that he couldn't even decide what to do or where to go. Kiefer Sutherland portrayed it beautifully.
It reminded me of the scene in "Philadelphia" when Tom Hanks stood outside the ambulance-chasing lawyer's office and silently faced the fact that he couldn't beat his illness and that no one was going to help him.
Two very powerful performances by fine actors.