Fairy Tale of New York is definitely one of the best Xmas songs ever written. There's only a couple of others I like, like "Let It Snow"(x3) and Christina Aguilera's version of "Have Yourself A Merry Little Christmas". Most of the others make me want to vomit
Anyone mentions Cliff bloody Richard and they get pushed off a cliff
Rick Astley is OLD MEME and stopped being funny ages ago. While we're at it let's have that 'Still Alive' song from Portal so berks with no imagination can shout 'T3h c4k3 15 4 l13!!!!1111' at each other on the internet for the next 15 years....
The only way to do it again with any dignity is to do it better, and the only way that can happen is to do it with something so repellant to the public tastes (Hammer-smashed Face by Cannibal Corpse or something) that the majority of people that hear it would have a job telling it was music at all. And a song like that will never get enough sales to do it. The only way it worked with RATM is that, for all it's much-vaulted 'edginess' it's still a very, very mainstream metal song.