I'm of the opinion that the only reason it is considered a great classic is the accident of it existing in copyright limbo for decades meaning that independent TV stations around the country were able to use it as holiday filler for very low cost.
Over time, it just became part of the holiday and overly sentimentalized like most holiday associated things are. But there is a reason it was generally considered a flop until well after that holiday TV ubiquity began. That reason is the movie sucks.
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