Oh gosh, I can't stand Mariah Carey.
Christmas music, for the most part, is... OK, at best. Most of it is really cheesy though, and overplayed to the point at which now it's just more annoying than anything. I used to like it, but when stores play the same playlist of 11 or 12 Christmas songs for most of November and all of December, you get tired of it really quickly. And I find almost all Christmas music sounds the same. Different genres, and different instrumentation, but at their roots, each song is the exact same.