Haven't read all of this but "Breakfast at Tiffany's" gets my vote. No story, no beginning, no end, mediocre acting, poor direction. Two hours of my life I won't recover.
On a wider note any film that has won an academy award is also worthy of being given a wide berth. I've only watched two - "Ghandi" and "A Passage to India". The first was the most anti-British film I have ever watched and should have resulted in Luvvie Attenbore being incarcerated in the Tower of London. The second was so memorable I've forgotten what it was all about.