I agree i wouldn't call it a Christmas special besides the fact it released on Xmas. Nardole and 12 are a good combo but i didn't care for the super hero story nor the bland superhero references thrown all out the episode. The plot sucked because there was none and the villains were useless and played second fiddle kinda like the Doctor did. The show didnt feel like Dr. Who and it has now turned into a kids show run by the worlds biggest fanyboy. TLDR the episode felt lazy.