Amen to that!
Actually, there are so many execrable Christmas songs it's hard for my to single one out.
As to the best, an embarrassment of riches - I like the Renaissance motets like Byrd's "O Magnum Mysterium" and Gabrielli's "Hodie Christus Natus Est". Handel's Messiah, Bach's Magnificat, and a multitude of traditional Christmas hymns and carols.
Etiam non princeps sed usque ad genua, Principis Pacis!