The snow angels/ice skating montage
I can't deny LOVE STORY is pretty bad. Ali's bad, the script is mediocre. Blah-blah-blah, it's all true.
But the era is the key to its appeal and perhaps it helps if one was alive at (and remembers) that time.
The snow scene essentially saves the film --- largely because it evokes the lost, bittersweet, melancholy mood at the cusp of the '60s and '70s (much as the urban street montage sequences in MIDNIGHT COWBOY or the first season opening theme of THE MARY TYLER MOORE SHOW did and do, or the entire film of HAROLD & MAUDE).
This is the way it actually felt to be alive in the world at that precise moment in time.
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The most profound of sin is tragedy unremembered.