There's nothing objective about that opinion at all. I think Mariah Carey's song is cynical corporate kitsch written for one reason and one reason only: to make money. That's why I hate it.

OP said it was "well produced". I don't believe that is meant to imply it isn't a soulless cash grab. Big production companies hire skillful producers to write/record/master these cheesy songs because it appeals to a larger portion of the population. Since most people prefer high quality records to something that sounds like it was recorded on a tin can in your garage.

That said, I disagree with OP's use of the term "objectively" when referring to something like the quality of a work of art. Even if I agree with OP that it is a well-produced record.

I love the Vince Guaraldi tracks from Charlie Brown Christmas, too. But I love Christmas and Christmas music in general, so this thread isn't for me, lol.