I would have said the Lion King, too, until Frozen came along....it's not that neither are horrible movies, I just think for me it's a combination of A) I'm missing the appeal, and B) Thee at times overbearing hype surrounding both outweighs the actual movies. As far as Nightmare Before Christmas goes, my friends and I were joking around the other day, that somebody somewhere saw it and grew up to be an executive in retail, and pitched the idea that, "Hey everybody loves this movie that combines Halloween and Christmas, what if once October 31st is over, we just jump right into Christmas Season, sorry about your luck, November and Thanksgiving!!" That being said however, I do enjoy Nightmare a million times more then the other two.
**I hate to be that guy, but there's also a certain irony to replacing Maelstrom with a Frozen ride, because that makes about as much sense as about most of the entire plot of Frozen**