For me, it's "Titanic." I thought it was overly long and a little boring. I'll admit that Leo DiCaprio is not my favorite actor.
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I also hated "Dances with Wolves." A real snooze fest, Kevin Costner's wooden acting, unrealistic plot. Nothing worked for me.
Not a film, but a musical. Hamilton. The actors were historically incorrect with looks. And I feel they..."modernized" it too much.