1. Der Riese - Nothing beats this map, it's the best map, this started everything: pack a punch, teleporting, monkeys, extra melee things. Especially the WaW version is amazing!

2. MOTD - This map is amazing, loved it and it wasn't all that hard if you had a little bit of skills. Loved the blundergat and the story behind the map and the characters. EE was great IMO.

3. Origins - A great map with a great easter egg. Great wonder weapons and a lot to do. The only downside is that everything takes a long time to get and it is really frustrating if you just got everything and one silly mistake kills you.

4. Moon - An okay map, I loved it but it wasn't my most favourite one. Had some nice things, a nice wonder weapon, a lot of perks, the hacker, the QED and anti-gravity. The downsides are sometimes you walk through a door and you get grabbed by the astronaut, and the excavators (or w/e they're called) are annoying as hell.

1) Ascension, introduced me to round 35 on 1st try. Even monkeys weren't hard once paping mustang & Sally

2) Mob Of the dead, Always loved my Tommy gun and RemingtonMCS870, and Im all set, I also do better as Finn O'Leary for a strange reason.

3) Der riese, Classic.

4) Die Rise, Introduced me to round 45 but It gets boring.

1. Five- Just generally fun. The Winter's Howl becomes pretty useless eventually, but it's still playable. Just good for wasting time because there's no real EEs or anything to be concerned with. Also, the boss never stops being threatening. 1 mistake and you lose a PAP'd Ray gun or thunder gun.
2. MotD- Altogether great. Blundergat has cool design. Map is very detailed. Enjoyable with friends, but not as fun if you're a loser like me with no friends
3. Tran... JK. Just messing with you. It's actually Kino. I'll have to admit that I originally hated this map, mainly because I hated how much more attention it got than Five so no one was ever playing Five. Finally took a crack at it on my own and it just grew on me. Very enjoyable, but the fire trap seems particularly useless IMO. Solid map and really a mix of casual and story that I like.
4. Ascension- The only reason this is 4th is because of Solo with monkeys stealing perks and the distance between each area without lunar landers. Otherwise, this would be #1. I personally just couldn't get a hang of it and losing my perks and not realizing it was annoying as hell. Yeah, I don't like Ascension as much as these other maps because I'm bad. Shuddup

1. MOTD, The feel of American gangsters + Alcatraz 
2. Kino, First map i player, thats what got me into zombies(also a classic).
3. Origins, so much to do and the WWII feel.
4. COTD, Big map, full of stuff to do. Also gave me a new zombies experience.

Not revelant but had to be here imo.

(5)Der riese/Moon. Der riese, another classic and introduces the PaP Moon, wave gun/zap gun and also the easter egg. 

1. Der Riese: Made me restart it about 50times with Gratinum to reach Round 115

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2. Kino der Toten: Was the hardest challenge for reaching my 219 rounds... REALY hard

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3. Mob of the Dead: Awesome map still trying to get 115 Rounds on this

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4. Shi No Numa: Just classic looks awesome, plays awesome

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5. Well don't like the other maps these are good but... no...
(I don't have any BO1 DLC except the moon one forgot the name)

1. Der Riese: Made me restart it about 50times with Gratinum to reach Round 115

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2. Kino der Toten: Was the hardest challenge for reaching my 219 rounds... REALY hard

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3. Mob of the Dead: Awesome map still trying to get 115 Rounds on this

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4. Shi No Numa: Just classic looks awesome, plays awesome

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5. Well don't like the other maps these are good but... no...
(I don't have any BO1 DLC except the moon one forgot the name)

ressurection - but the map is actually called "moon" so you were already correct

My favorite COD maps are (in no specific order):
Mob of the Dead
Call of the Dead
Der Riese
Origins

I especially like Origins and Mob of the Dead because you can beat them (aka do the easter egg).

Der Riese
Mob of the Dead
Ascension
Moon

Mob of the Dead
Call of the Dead
Moon
Five

1. Kino Der Toten
2. Der Riese
3. Ascension
4. Call of the Dead

In no particular order..

MOTD
COTD
Buried
Origins

I also enjoyed Shi No Numa, Moon, and Ascension.