Yeah but it doesn't really scream spookyness.
https://wiki.teamfortress.com/wiki/Ghost_Town (coaltown)
https://wiki.teamfortress.com/wiki/Eyeaduct
https://wiki.teamfortress.com/wiki/Ghost_Fort (lakeside)
https://wiki.teamfortress.com/wiki/Sinshine
These maps dont excel at spookyness aswel, some maps have some more indications than other, but none of them are fully detailed into halloween theme. Does that realy mean its bad? Not at all. I rather have a nice looking and decent playing map with a gentle halloween theme than those that try to go over the top at a cost of actualy looking nice.
Seems more like a peaceful town at the foot of a mountain than a spooky scary skeleton-spawning HHH-infested spooktown like Helltower or Mann Manor.
https://wiki.teamfortress.com/wiki/Helltower
1 side has some spookyness side similar to ghost fort. but the other side is still equaly bland.
https://wiki.teamfortress.com/wiki/Harvest_Event
Yes, its skybox is spooky and has some halloween props, but other than that it still has the general theme of the non halloween map.
Many might think that a halloween map must be stuffed with things, but thats often bad as visual clutter only makes the gameplay end up less good. More often its just the basic map with some alterations in the skybox to actualy avoid players to be hindered. I rather see a map that has some proper artpass on it that doesnt look like it recieved some specific additions to halloweenify it. It should have the theme by default.
Even looking at my own map
http://steamcommunity.com/sharedfiles/filedetails/?id=455168490
It has a huge skull in the middle, and on the sides it has some halloween props. but if i would put normal lighting in it and exchange those props for regular tree's it wouldnt change the map at all in gameplay. And it would remove its spookyness. The only reason you probably see it as being spooky is that skull...
If there is something i dislike about all these recent halloween updates its the spam that valve puts in the game 'to make it interesting'. Sure bossfights can be nice with it. But that bossfight realy doesnt need an overly visual spammy map with it.