Pros:

+Unique and intense crescendo events
+6 large maps
+Fair amount of detail
+Decent level design, dynamic paths
+Challenging
+Awesome gun store in map 5
+Excellent finale
+Each map had plenty of supplies
+Custom panic events
+Survivor dialogue
+Good atmosphere
+Jimmy Gibbs Junior zombies

Cons:

-Overwhelming at times
-Several areas could use more detail
-Navigation was confusing at some parts
-Not enough variety in the levels, everything looks the same and feels repetitive
-Bots have trouble
-Missing tank music in the finale
-Buggy intro

Conclusion:

A long and challenging campaign, although at times its a little too difficult and starts to get boring halfway through.

Pros:

+Interesting lighting
+Awesome crescendo events
+Large detailed maps
+Very challenging
+Plenty of supplies
+Good variety of environments
+The Blue Danube Waltz plays at the finale

Cons:

-Terrible finale
-Certain areas have little detail
-Bots frequently have serious issues

Conclusion:

Overall a fun campaign with some unique elements, the finale was a major letdown though. I was expecting something creative and different after playing through the preceding maps. It was way too easy, the whole area was bare and lacked basic detail, very disappointing.

Pros:

+Brilliant atmosphere
+Good level design and detail
+Fun crescendo event in map 3
+Solid length
+Somewhat unique finale
+Balanced gameplay/difficulty
+Loved the forced car alarm event
+Satisfactory amount of supplies, though the finale could have done with more
+Map transitions flow smoothly

Cons:

-Only 1 tank at the finale
-No uncommon infected
-Some parts of the campaign feel dull and unoriginal, mainly concerning the first 2 maps

Conclusion:

An excellent campaign that supplies challenge and enjoyment in the right amount of doses. 

Pros:

+Gorgeous environments
+Beautiful lighting and atmosphere
+Fantastic level design
+Great length for 3 maps
+Challenging
+Detailed

Cons:

-Not enough supplies in the bunker
-Finale was annoying, especially with bots
-The church event is suddenly sprung upon you without warning, the first time I had no idea what was going on

Conclusion:

For a 3 map campaign it provides: challenge, detail and enjoyment, the finale really kills it though.

Pros:

+Insanely fun and creative puzzles/traps
+Mysterious setting and story
+Unique maps abounding with original ideas/elements
+Clever gas can system that forces you to moderate your supply use
+Bots perform surprisingly well
+Simple textures and details that suit the gameplay
+Challenging but fair
+Relies on good teamwork
+Horde and special infected spawning was perfect
+Portal-esque feel
+Good length for a 4 level campaign
+Finale was climactic, until the very end

Cons:

-Although the bot support is generally good, there were moments of chaos, mainly in map 3
-Can be punishing for beginners
-Not enough survivor dialogue
-Graffiti in the safe rooms could have been used to set up a more interesting story
-The ending was disappointing

Conclusion:

A fantastic campaign that makes players feel like experiments in a very hostile environment. I would have liked to known more about the story, but the gameplay more than makes up for it.

Pros:

+Amazing detail
+Brilliant level design
+Tons of variety, always doing and seeing new things
+Fantastic setting and atmosphere
+Football player tanks and foam hands
+Long campaign
+Creative crescendo events in map 2 and 4
+Epic finale
+Custom dialogue, textures, models and music
+Portal Easter egg
+Co-op, versus, survival and scavenge
+Good amount/spacing of supplies
+Great flow of infected, balanced gameplay

Cons:

-No icon for the foam hand

Conclusion:

An excellent L4D2 campaign, loved everything about it, the Easter eggs were awesome! Perfect 100!

Pros:

+Custom Mario textures and models
+Question blocks that drop supplies and zombies
+Unique challenges
+Funny Easter eggs
+Piranha plants and turtle shells
+Low gravity at certain points
+Flagpoles and elevators/platforms
+Awesome finale
+Balanced gameplay, indoor and outdoor areas
+Plenty of instakill opportunities for infected in versus

Cons:

-The bots struggled with the difficulty and all of the obstacles
-Some Mario music and sounds would have been nice
-Although the finale was great, it was too easy for my taste
-Too short

Conclusion:

An FPS/platformer hybrid that is both challenging and fun.

Pros:

+Huge map
+Lots of areas to defend
+Korax
+Faithful and accurate recreation
+Hexen textures and music
+Perfect atmosphere
+Generous amount of supplies

Cons:

-The bell doesn't make a sound when shot

Conclusion:

There are basically no good cons I could note when reviewing this map, its a brilliant replica of the first level from the classic, Hexen. Loved it and will be playing it for months to come!

Pros:

+Excellent recreation
+Good amount of supplies
+Keycards 
+Exploding barrels
+Doom textures 
+Great nostalgia 

Cons:

-Needs Doom music and sound effects
-Too easy, could use more special infected and a tank
-Bad replay value
-Bots don't pick up most supplies/weapons or open doors
-Lighting needs improvement in some parts

Conclusion:

A faithful recreation that makes me want to play the whole Knee Deep in the Dead episode through L4D2. Considering its only one map, you could of made it more difficult in order to prolong the experience.

Pros:

+Good intro
+Splendid detail
+Brilliant atmosphere
+Great design
+The blackout in the sewers was a nice touch
+Challenging crescendo events
+Excellent finale
+Satisfactory amount of supplies
+Howitzer that fires NPCs, very humorous

Cons:

-Finale needs ammunition piles
-Path finding was confusing at times
-Bots failed at the finale

Conclusion:

A detailed and fun map with an awesome finale, the bots had some trouble though which damaged the experience.

Pros:

+Creative finale
+Custom music
+Choice of two paths at certain points
+A few unique events
+Plenty of supplies
+Rushing to the hot air balloon was intense and very fun
+Bots had no trouble
+Gameplay flows smoothly
+Interesting environments

Cons:

-The first 3 maps are dull
-Lack of detail at several areas
-Too easy
-Needs survivor dialogue
-The whole campaign is set in broad daylight, the finale was a perfect chance to shift to nighttime

Conclusion:

The campaign started off quite poorly but picked up on the last 2 maps, for the most part it was an enjoyable experience and I'm glad it ended on a high note rather than a low one.

Pros:

+Nice layout and detail
+Lots of paths throughout the tower
+Good placing of supplies
+The top of the tower is a great camping spot and also provides a beautiful view
+Reminiscent of Dead Air

Cons:

-Tower feels cramped 
-No defibrillators or laser sights
-Too easy
-Hardly any horde reach the top, you mainly just fight off special infected and tanks.

Conclusion:

A visually appealing map that provides good tank training over anything, you should rename it to Tank Tower.

Pros:

+Stunning detail
+Custom textures and props
+Bowling
+Skee ball 
+Working cinema
+Large map
+Brilliant recreation
+Lots of places to hold up in
+Several foot lockers
+Survival and scavenge
+Unique ways to start the horde
+Great atmosphere

Cons:

-Interior spaces are impossible to defend
-Random sewer, why?
-More of an eye candy map than a playable one

Conclusion:

One of the most detailed maps for L4D2, while the to-scale recreation is awesome, it really doesn't compliment Left 4 Dead's style of gameplay. I had more fun exploring the map than facing off against the endless amount of zombies that quickly inhabited it.

Pros:

+Original
+Very challenging
+Excellent maps
+Unique events
+Tons of variety
+Beautiful environments
+Supplies galore, especially in the final safe room
+Good length
+Great replay value
+Insane amount of action, always fighting something

Cons:

-Navigation was frustrating at times
-Bots have frequent trouble
-Could use more tanks
-The finale was easy compared to the levels before it, I like a real challenge to finish a campaign off

Conclusion:

This campaign has a wonderfully creative look and feel about it which I can't help but love, easily one of the best on the site!

Pros:

+Great nostalgia 
+Enough supplies to get by
+Solid conversion
+Designed to suit L4D gameplay
+Fun crescendo events

Cons:

-The spinning blade trap in the tunnel would have been a nice touch, while also presenting a good challenge
-Finale was dull

Conclusion:

Along with City 17 this is the best Half-Life 2 port for L4D2, classic zombie slaying gameplay with a fantastic HL2 atmosphere.

Pros:

+Perfectly designed to fit L4D gameplay
+Great detail
+Good amount of supplies
+Challenging crescendo events
+Custom music

Cons:

-Too many witches
-No radio dialogue
-Finale was quite boring, would of liked to see something unique done with it

Conclusion:

The best Half-Life 2 port available for L4D2, a solid release that provides an enjoyable experience.

Pros:

+Great challenge
+Large, well designed map
+Lots of physic objects for the tanks to use
+Safe room
+Escape via helicopter
+An army of tanks
+Good amount of supplies
+Many different paths to take while fleeing from the tanks
+Countdown tower

Cons:

-Would be better if it were just tanks
-Gets boring quite quickly, especially when playing with bots
-Hits hard at the start
-Basic detail

Conclusion:

A fun map if your looking for a challenge, my suggestion would be to remove all the infected besides tanks of course.

Pros:

+Unique and creative
+Great design
+Custom boss
+Gnome room
+Jockey eggs
+Random item caches
+Custom textures and skybox
+Provides a serious challenge
+UFOs
+Good finale
+Lots of zombies to kill

Cons:

-End boss was overpowered
-Needs more throwable weapons
-Hordes can be overwhelming
-Impossible to solo
-Hard to locate weapons at the start
-Lack of supplies at the boss, the gnome room helps but needs more indication

Conclusion:

A fun and challenging map, at times the difficulty punishes the enjoyment and it's pointless playing it with bots, round up your buddies.

Pros:

+Original
+2 custom boss battles
+Puzzles
+Balanced gameplay
+Traps
+Grand finale was entertaining
+Excellent pacing of tanks
+Can be finished with bots
+Small map with lots in it
+Supplies were laid out well
+Perfect sized arena for fighting

Cons:

-Finale was too easy
-Could use more detail
-Dying and going back to the start is frustrating

Conclusion:

A unique map that offers puzzles, traps and lots of zombies, the finale was anticlimactic though.

Pros:

+Alien atmosphere
+UFO flies overhead
+Gorgeous lighting and waterfalls
+Custom content
+Lovely skybox
+Humorous poster and intro
+It looked so good that I explored every square inch in amazement before I unleashed the carnage and spilled zombie blood all over the place

Cons:

-Needs more supplies
-The gameplay doesn't match the visuals in quality

Conclusion:

You have a real talent for creating visually appealing maps, I understand it was a devtest and yes, I would hire you :)

Pros:

+Difficulty levels
+Panels
+Traps
+Breakable walls
+Barriers
+Nice visuals
+Time slowed explosions
+Large area
+Survival and scavenge
+Portal-like design
+Many places to defend

Cons:

-The detector is loud and annoying
-Bots get stuck on the doors at the beginning

Conclusion:

A unique map with several great features, a clever mix of Portal and L4D.

Pros:

+Stunning detail
+Large map
+Good amount of supplies
+Lots of useful areas to camp and defend
+Great design
+Theater plays Night of the living dead
+Elevator
+Jukebox
+Survival and scavenge

Cons:

-Bots have some painful moments around the elevator

Conclusion:

One of the best maps I have played, the rich detail and variety of areas keeps me coming back to defend the theater.

Pros:

+Unique defense gameplay
+Addictive
+Leveling system
+Fun and challenging random events
+Large infected waves

Cons:

-Bots fail
-Hard to understand what everything does when first playing
-Very basic detail
-Could do with some more gas cans and propane tanks

Conclusion:

One of the most unique and fun maps I have come across, don't bother playing with bots though, they are useless. 

Pros:

+Custom melee weapons
+The infected are skeletons
+Very faithful to the film
+Ash's car
+The pit
+Necronomicon portals
+Catapult 
+Quotes and music from the film
+Great areas to defend
+Perfect amount of supplies

Cons:

-The tanks are too frequent
-Too many special infected
-Not enough common infected
-No laser sights
-The catapult has a delay when activated
-The jail portal is pointless and annoying

Conclusion:

I am a huge fan of The Evil Dead trilogy so this map is a dream come true and it did not disappoint, one of my favorites.

Pros:

+Wonderful Christmas environment
+Beautiful skybox
+Colorful lights
+Snowmen and Santa
+The main house has a soothing warm feel to it
+Jukebox plays appropriate music
+Great Christmas models and textures

Cons:

-Too many locked houses
-Quite small
-Aside from the houses there isn't much else in the map

Conclusion:

A perfect map to play on those chilly winter nights, I can see why it's the 2010 Xmas Spirit Winner.

Pros:

+Great detail
+Quick and easy to travel through the house
+Huge destructible doors that fling open
+Indoor and outdoor environment
+Giant movable objects
+Decent amount of supplies spread throughout the map
+Custom models and textures
+Survival and scavenge
+Nice lighting

Cons:

-No laser sights
-Make the top of the stairs accessible and put in an attic
-Sometimes I get stuck in the skateboard
-Outside could have more than just a playground, maybe a sandpit?
-The playground needs more supplies

Conclusion:

A fun and detailed rat map that becomes an explosive battlefield with large objects and zombie parts flying everywhere.

Pros:

+LOTR soundtrack
+L4D1 survivors
+Large map
+Great atmosphere
+Detailed recreation 
+Scripted events that take you through the fortress
+Ample amount of supplies
+Custom NPCs
+There is an ending
+Replay value
+Perfect flow of infected

Cons:

-A map meant for human players, not bots
-Another heavy machine gun in the keep would help a lot

Conclusion:

An extremely enjoyable LOTR experience that is true to the film and perfect for the L4D universe. It's also one of the only survival maps I have played that I would award 100.