For me, when it comes to Sci-Fi movies, the worse they are the better. I like using my imagination. I don't need many flashy effects. Plus, they're good for a well-intended laugh. These crappy old films possess a certain naive charm that CGI laden films lack. Part of the appeal is the fact that these people who made the films actually thought they were doing great work, for the most part anyway. The bad acting and lousy effects are sincere and superb. And when it comes to crappy Sci-Fi Christmas movies, one film stands alone... "Santa Claus Conquers the Martians" (1964).
In a nutshell, the Martians are upset that their kids are glum and obsessed with watching Earth TV programs about Santa. Their solution... to kidnap Santa and bring him to Mars to cheer the kids up. Of course, to be expected, there are some Martians with ulterior motives concerning the ultimate fate of the jolly old elf.
Watch and see. Who knows? Maybe with imagination and good humor, this odd Christmas hybrid gem will find it's way into your annual Holiday movie lineup. Eh, probably not... but it's worth a shot.