This map has a wonky history, I remember seeing it over the years on the Workshop in multiple themes, each one looking bizarre and not very TF2-artstyle fitting in my opinion. And I liked it, though I wouldn't think it's acceptable as an official map. And last year it was flung into a position of importance by its official inclusion. My issues with this map lie with its visuals, its framerate, Rüdy never rolling back, and bugs/exploits.
I love the whimsical wonderland theme in the thumbnail, touches of violet, sprinkles of gold, Christmas peppermint stripes and baubles. But ingame it's this weird mountain storm and mismatched blue haze, the TF2maps screenshots look far more complimentary than live. This map would look great with a visual makeover.
The framerate hurts to play sub 60 frames, and I could excuse it if it truly was never playtested because maps will run worse rendering more players to what seemed acceptable privately testing.
Rüdy never rolls back unlike every other Payload map. Maybe this is because the chokepoints can be gruesome to attack, which also explains the long round timer and this was intended to help BLU keep ground. It's kind of cool but does come across as a bandaid balancer knowing every inch the cart moves can never be returned.
The bugs and exploits have gotten better, though I still see people jumping over invisible walls, exploiting the one-door exit spawns to spawn camp, or placing sentries inside spawn doors as they transition for cheesy kills. Those can be patched however, so I wouldn't hold much against Wutville there.
Overall, I think Wutville has become the butt of a joke in the community. I like playing on Wutville (and no I'm not only playing as Sniper), and that's not pity either. I like to be optimistic and say Valve liked the unique theme, the unique fighting engagements, and Wutville's Christmas spirit for a limited time map pool. But I don't think map is reaching its potential right now for the issues I've listed.