Imo the dungeon was very great. It was something new, something you had to do with multiple persons which increases the fun factor and it wasnt to hard or to easy.
Also it didnt got destroyed by some random rng stuff, where you could think its just made to heck up people.
Also the second part, the solo dungeon, was very nice. Those riddles were most of the time really fun, and it is to highlight that the conzept of those riddles was not to be as time consuming and annoing as possible - they werent annoing in such a way that you felt bored because you know you have to figure out stuff by brute force for example. You were able to figure out how to progress in a good way. You were also able to dodge many fights, you saw the changes on the switch puzzle directly, you could observe those lasers with save spots where you would be unharmed. Thats good design.
The old maps were to most part pretty counterproductive. It was way to big. If you dont know those maps, you literly have no idea where to go and what to reach where.
I mean, those are 2 (or even 3?) event maps and all are huge. Especially because we have no map to navigate.
As well I thought I could do a quest on the old maps because a npc asked for help. Later I had to figure out I have already done the quest... I couldnt really see if I had to do anything or if everything is done.
Everything that was new was cool. Especially because it didnt felt like the creator(s) is a sadist and wants to annoy you as much as possible. The old stuff was just to big since you could literly do nothing besides hunting, 1 boss and a exca.
It didnt felt much like a christmas event, but I still go out with a positive thought.