Kind of all over the place, fairly underwhelming, overall one of Moffat's poorer Christmas episodes. The idea of the Time Hotel was compelling enough, but the execution really wasn't adequately explored. Actually, that's true of most of this story; characters like Joy, Anita, and Trev were all set up to be quite interesting, and I did like all of them, but there wasn't enough time spent with any of them to make an impression. The arc of the Doctor getting stuck on Earth as a handyman was interesting, and the threat of the Star Seed was as well, but ramming one into the other like that was a tonal mishmash that detracted from the narrative flow more than it supported the theme of the Doctor being lonely and needing to be around someone (very original, by the way, certainly hasn't been the central theme of countless other Christmas specials).

On the positives, as I said, I thought the characters were interesting and likeable, if underdeveloped. I especially liked how the Doctor was done; Moffat does do a good 'smiling through the pain' Doctor, after all, and when he was verbally eviscerating Joy... yowch. His... semi-apology afterwards was good as well. "There is no bad way to save a life," indeed. It's giving Seven.

The Bethlehem bit... eh. I didn't love it, I thought it was weird, kind of a twist to end on... I suppose it was a bit inevitable, really, given the whole Christmas star thing.

Overall, I thought it was fairly mediocre and saccharine, but that's Christmas specials for you. Most likely I'll enjoy it more on a rewatch when it isn't the middle of the holiday season.