Well, it's not really endless. There were a few seasons, a few movies, and now a few more movies. Regardless, whether it ends or doesn't end doesn't make it remarkable or unremarkable. Quality is what does that.
As for the Christmas thing, your mileage may vary. Catholics tend to be more into Jesus' humanity and sacrifice, while non-Catholic Christian denominations often focus more on his feats. Regardless, most of them are more about what Jesus did as an adult, rather than what happened in a manger.