I can totally relate to associations behind a song ruining it for you. For me "Have Yourself a Merry Little Christmas' is one of the most flippin' depressing songs I've ever heard, probably because I listened to a 24-hour Christmas station in college and was feeling really depressed, and they kept playing it to death. Actually there are several songs I don't necessarily dislike, but they don't do much for me anymore because if you love Christmas music as I do and like to listen to it a lot, there are certain songs that get over-played to the point where they become a channel flipper. The only two songs I can think of now that I can't stand are "Santa Baby", anyone's version, and "Last Christmas." The only version of "Last Christmas" I can listen to without wanting to get sick is Celtic Thunder. I still don't like it, but I adore CT, and Neil has a great voice so it makes it a bit more tolerable. It was actually pretty good at their concert I went to on November 16, although still not the best song in the world by any means. I think if the guys would have harmonized in it or they would have done it in an Irish style I might have enjoyed it better.
My feelings on instrumental style is that I like Christmas music done in any style that I would normally like. This may not be popular with a lot of you guys, but my favorite Christmas songs are country versions. This is because when I was a kid I listened to country almost exclusively, and I have fond memories of hearing the songs they played on our local country station, especially on Christmas Eve when they had a program with all Christmas music with voiceovers by country artists, although my little kid brain thought they were live. I love all the traditional versions that everybody knows, but those country versions as well as some songs that were original to the country artists are very special to me. There are certain songs that I have to hear, such as John Berry's cover of "O Holy Night" and the Judds "Star of Bethlehem" or it doesn't seem much like Christmas unless I hear them. I know that's probably pretty unusual, especially on this board.