Pros:

Beautiful world
Intense finale
Custom textures

Cons:

Frustratingly difficult
Bad A.I.
Short
Dull gameplay, even though the environments are cool

Conclusion:

Very frustrating and glitchy. The environments are what make this worth while.

Pros:

Amazing world
One of a kind
Good progression

Cons:

Boring Finale
Short
Really glitchy

Conclusion:

Just wish it wasn't so short. Otherwise, the environment and the gameplay is quite good.

Pros:

Memorable Finale
Detailed
L4D1 feel

Cons:

Early missions lack atmosphere and creativity
Not enough variety in setting

Conclusion:

I liked this one mainly because it reminded me of L4D1 and had a fun finale. Just needs more spark in the earlier levels.

Pros:

First level is fantastic
Nice realism
Well constructed

Cons:

Terrible A.I.
Way too repetitive
Pathfinding
Short

Conclusion:

Realistic and well made, though very repetitive and uninspiring.

Pros:

Great architecture
Lots of custom textures
2 way path system is innovative
Lighting and atmosphere in the later levels

Cons:

Confusing level design
Lacks memorable moments
Zombie spawning glitches
Slow paced finale

Conclusion:

Nice design, but lacks substance. Overall quite fun and unique.

Pros:

Crash Bandicoot universe in all its entirety
Muisc, level design, atmosphere, etc. are all top notch
Completely customized and revisioned for L4D2
Everything is just stunning
Nostalgic

Cons:

Minor glitches

Conclusion:

Simply the best custom campaign for Left 4 Dead 2 to date. 

Pros:

It's Lord of the Rings

Cons:

No music

Conclusion:

Best map ever! Still it needs an update that will include music. Please make more Lord of the Rings maps. It's the best thing that ever happened to Left 4 Dead 2!

Pros:

Imaginative level design
Mirror's Edge feel
Simplistic yet fun
Doesn't get repetitive
Hilarious tanks and special infected
Light hearted
Amazing A.I. navigation, etc.
Finale is one of the best I have ever played
Perfect length

Cons:

Levels 2 and 3 need more polish
Could have used more interesting level layouts
Too many witches
Can get confusing as to where to go

Conclusion:

Just plain fun. Great co-op. Lots of laughs.

Pros:

Near perfect port of Half Life Ravenholm
Balanced difficulty
An instant classic
Professionally done in all respects
Doesn't require a texture pack

Cons:

The Mine level was a bit boring
The Finale got frustrating after a while
Needed more creativity in the level design in the later levels
A.I. glitches

Conclusion:

Great campaign set in the Half Life universe. Requires no texture pack and is extremely well made.

Pros:

Minecraft in Left 4 Dead 2
Minecraft survivors, guns, enemies, etc.
Tones of detail
Great level design
In-game Minecraft crafting
Levels 1, 2, 5, and the easter egg are fantastic

Cons:

Glitches other addon campaigns
A bit lackluster at times
Levels 3 and 4 are repetitive and could have been done more creatively, considering the scope of Minecraft

Conclusion:

I can tell a lot of hard work and effort has been put into this. From the in-game crafting to the modding of just about everything, this is truly a huge project. In all honestly, I was really impressed, but still felt that you could have chosen better locations for levels 3 and 4 (for example: with more scenic vistas, a beach level, etc. Just more exotic locals that really bring out the best in Minecraft). Regardless, on any level it deserves recognition as a fun campaign set in the Minecraft world. You should also try to fix the fact that it glitches other addon campaigns, which is a major disadvantage.

Pros:

Reliving Half Life 2 in Left 4 Dead 2
Brilliant mapping makes it extremely accurate to the source material
Great HL2 lighting and atmosphere
Lengthy

Cons:

Requires the Half Life 2 Texture Pack
Extremely difficult
Glitches with the train killing the computer survivors
Finale is nearly impossible to beat on any other difficulty besides easy 

Conclusion:

This is a must have map for any fan of Half Life 2. Bedides some glitches and the difficult spikes it is one of the best campaigns out there. Looking forward to the next chapter.