The casting of High Noon never saw with me well. First, I think Gary Cooper is typically about as interesting as a sheet of drywall. Second, it's impossible to buy that Grace Kelly is so in love with this old charmless stiff.
Cooper was twenty-eight years older than Kelly, and had a lifetime of health issues that made the gap seem even larger.
On a sidenote, what was the new sheriff thinking when he arrived the next day? First day on the job and he has to deal with several dead bodies in the street, major property damage from a hail of bullets, a stable decimated from a fire, and the town horses running wild. Not exactly what he signed up for.