I don't get the hate for the Nightmare before Christmas overlay. I got to see it for the first time last year and I truly enjoyed it. It's a temporary alteration from the norm and can be a nice change.
I enjoyed it to when I got to see it. The reasons are: Some people aren't fans of the franchise, some people do like Nightmare but don't like how Christmas is celebrated during Halloween, classic version is only available for half of the year, and WDW is the flagship resort where people want everything to stay classic since it's the "tourist destination."