Cliffhanger,without a doubt,loved that level,but annoying in some parts.

Of Your Own Accord was a blast, Second Sun was really cool, and Cliffhangar was a lot of fun too

Oh single player? Then probably Second Sun/Whiskey Hotel. They're both two separate missions but Second Sun is so short I'd count them as one. :/ The first encounter of that mission in the blacked out office building with the monsoon raging outside is amazing. 

If it was multiplayer, though, then without a doubt I'd say Terminal and Favela. 

Wolverines!

Hmm... I think I'll have to replay the whole campaign again to come up with an answer.

Cliffhanger . . . made me long for some good old SOCOM US NAVY SEALS action

I'm going to follow the crowd and say cliffhanger.

The oil rig one, cant remember the name

All the levels are great but all the ones in America was pretty deep for me just seeing a American town on fire. 
Cliffhanger was also good.

" The oil rig one, cant remember the name "

" @KennyPowers said:

" The oil rig one, cant remember the name "

The Only Easy Day... Was Yesterday was pretty cool because of the breaching and clearing. "

All of them are really good in their own ways, but I can't come up with an answer. I'll come back to this after playing it again.

I just got the game and the first map that came up was called Wasteland I believe.  Was delighted to see that it looks like almost an exact remake of a CoD2 map.  So basically now it is a WW2 map but with modern weapons :p.  Which is funny because I saw a thread on another site about how that map was ripped off from a custom map for CoD4.

The Post EMP level was probably my favorite, having airplanes and helicopters falling form the sky at the start of the level was awesome.

" The Post EMP level was probably my favorite, having airplanes and helicopters falling form the sky at the start of the level was awesome. "

Shown the best of what can Infinity Ward do with a engine that's over 10 years old. "

  
invading the caslte

" @ThePhantomnaut said: 

Shown the best of what can Infinity Ward do with a engine that's over 10 years old. "

I really hope that was a typo because this game was not made on the same engine that the original Call of Duty was made on. Pretty sure this was just a heavily modified version of the IW 4 engine used on Modern Warfare and World at War. Back to the topic, I love Terminal and the Sub Base levels for Multiplayer, and Endgame was a pretty amazing level just because of all the random shit that goes on including the end which was a bit too much like the end of COD 4 but it was still great. "

Cliffhanger and the missions in the U.S. I also love the first moments of Endgame when they emerge from being hidden.

Whiskey Hotel stands out in my mind. 
 
Fighting up the lawn of the White House and then popping those flares was really memorable.

Gotta replay.

" @Babble said:

" The Post EMP level was probably my favorite, having airplanes and helicopters falling form the sky at the start of the level was awesome. "

Shown the best of what can Infinity Ward do with a engine that's over 10 years old. "

 
@fillmoejoe said:

"  I also love the first moments of Endgame when they emerge from being hidden. "

" Gotta replay. "

Probably Loose Ends and Contingency 
 
Contingency was nice in the sense that they seemed to want to redo 'All ghillied up' (although not as obviously as the beginning of 'Just like Old times'). I also liked how the level became more action packed and blowing people up with the predator. I also like them because of the effects they have on the story.

the one in the snow with Cpt. Price.. good old 2-snipers-inflitrating action

Cliffhanger was really good, I love snow themed levels in general, and this one had some awesome scenes.
Hornet's Nest was awesome, really intense and chaotic.
The only easy day.. was yesterday was pretty good too.
The Gulag had some really cool set pieces, and finding the prisoner was cool!
Contingency was pretty good, but probably because of the snow..
Second Sun & Whiskey hotel was cool, and had some memorable moments (SPACE)
Just like old times & Endgame were great, because of obvious reasons.
 
Thinking about it, I like almost the entire campaign. I didn't find the Burger Time or Takedown missions fun at all, but the rest were great!

The Gulag or Gulash or whatever it was called was pretty sweet. Did not suspect I'd see

"Whiskey Hotel stands out in my mind.  Fighting up the lawn of the White House and then popping those flares was really memorable. "

They were all good

The only levels I could not get into were the suburban levels like the strip mall or the level where you have to go from house to house. Guess I'm a sucker for more linear levels.

Any stealth level. I absolutely love how they do stealth in these games.

I don't know..it was so easy to say in CoD4, but with this game, not so. I do like Cliffhanger.. as well as that, I would probably have to go with Hornet's Nest. I like the very start of that level.   

the brazil favelas level was awesome (the correct portuguese the enemis spoke helped with the mood too), but i loved the level after the nuke and all the power if out, and its pitch black. had some amazing visuals

" Wolverines! "

Whiskey Hotel.

" @ThePhantomnaut said:

" Wolverines! "

NEVER PLAYED IT!   is it cool? "

"
All I remember is grinning for about 10 minutes straight after 

SPOILER WARNING: Click here to reveal hidden content.

Finding Captain Price alive

So pro bably which ever level comes after that. 
 
@OutOfBounds9000:Put an 'effing spoiler alert there.
"

Oil Rig, Gulag, Airplane Graveyard

" @Ahmad_Metallic: So you're saying I should just not cover it up at all. Like OutofBounds? . "