Moon from BO1 by far. Although I hated the fact that each of those freekin saws would almost always glitch in the higher rounds and stay down one by one until eventually all stayed down and you couldn't get back to the main part of the map when returning from Earth.
If I had to pick a second favorite it would be Origins
I Answered to one of these threads not long ago, there are lots of people's favourite to least favourite and reasons why, just use the search bar if you want the info.
anyways my fav is prob moon. They needed to continue the same quality storyline and game mechanics from that point on but they didn't . Zombie drops were cool, low gravity was cool, no mans land was ace, Shangri la introduced tougher zombie types and they weren't seen again. They have to cater to the masses, which means if maps are too hard to play, they lose custom. Sad world ain't it?
If you are looking for 1000 response then you will not get it from this thread.
1. Not many ppl visit here anymore.
2. Survey has been done.
You are best like what Chucky said to go through the search and canvass the results from there and combine it. You still most likely will not get 1000. Best to extrapolate your results.
Here is my contribution to your survey:
WAW - Der Riese and Verruckt
BO - CotD, Five
BO2 - Farm/Town Survival (yes that's right)
I would say..... Shangri-La, the difficulty is hard from the ay people talk about (which I like). The map reminds so much of Verrukt with the tight spaces, and we also have roller coasters (of love!) and a water slide. The Easter Egg song is my favorite out of all too, the Easter Egg was sort of a disappointment and sucks that only one person can get the perma-perks (though I had to trick some people to let me have the Focusing Stone). the Shrink Gun is a great WW, and overall I love this map with a passion. Something about it makes me always want to come back to it.
Mob of the Dead & Der Riese..
MOTD : Its wickly cool looking, PAP weapons look like they spawned from hell. Not to mention. Hell's retriever.
a weapon that never runs outta ammo. Very useful in higher rounds.
Der Riese : Whats not to like.. I love everything about this map. Plus once the whole map is opened. I kick sooo much a$$.