Pros:

-A lengthy campaign in the woods.
-Good woods design.
-Simple and fun
-Ammo cache locations are well-placed.
-Some improvement from original "the woods "

Cons:

-Finale is really disappointing..the truck is already there and all you have to do is stand and wait on top of it.
-After all survivors made it to the end, you will all be shown in another safe room for a second.
-No cutscene for finale.
-Bus..why are there so many bus in the middle of the woods?
-The AI of bots are really pains in the ass. They trend to fall behind for about 20-30 metres, and several times they stop shooting in the face of hordes and the tank. Sometimes they refuse to help teammates at risk(Being dragged 15-20 metres from them and being slowly killed without a single shot coming from ANY of the bots)
-The sewer is very unpolished.

Conclusion:

Worth a try.

Pros:

-Good forest design
-not very hard
-plenty of pills
-ammo location is good
-simple and fun

Cons:

-short, consisting 3 maps only.

Conclusion:

I like this campaign.

Pros:

-Half-life inspiration
-No missing textures
-Improvement from the original Ravenholm

Cons:

-Way too linear
-4 maps only
-AI sometimes refuse to help stucked teammates.

Conclusion:

A nice addition to any add-on file.

Pros:

-Excellent level design
-Large map size
-Good graphic
-Ammo location are well placed.
-Several ways to reach the target
-A lot of molotov and pipebombs for the tactical slaughter! 

Cons:

-Hordes could spawn in front of you.
-Special infected spawn very frequently, especially on the last level.

Conclusion:

A campaign that is of the Valve quality.

Pros:

Stunning visual
VERY challenging
Nice environment

Cons:

Too long (Took me nearly 2 hour to complete it on advanced difficuty)
Too many random swarms of infected. There were >5000 infected killed in 1.8 hour..(>2000 by myself)
Lack of ammo is a common occurence.
Tanks occur twice a map, together with swarms of infected.
Some areas are repetitive, feel like walking over and over again on the same place.

Conclusion:

nevertheless, it is still a decent campaign and the visual may still surprise you, if you get a moment. 

Pros:

Simple-yet there's freedom among that simplicity. (there are usually several ways to reach the target)
Level design are quite good.
Not too challenging even on expert difficulty.
Only 35 MB in size. A humble size.

Cons:

Too short?
AI problem at finale-keep getting up and down the laders.
The beginning of the finale map is virtually the same as the fourth map. 

Conclusion:

I like this camopaign, it is not the one who boosts about how "hardcore" or how big the size of file it is. 

Pros:

Large enough
The final map is okay

Cons:

Boring
Lack of guide in such vast area
Illogical
Finale is  a little confusing.
The first 4 maps feel like repeating over and over again.

Conclusion:

Worth trying if you have plenty of time.

Pros:

Beautiful graphic and level design
immersive
Map is larger than normal
Well executed
Finale is fun and innovative-who would ever thought of a balloon esape?:)

Cons:

AI get struck in finale-at the stairs.

Conclusion:

Almost perfect, this is one of the best campign I have ever played!

Pros:

Excellent levels design-logical
Creativity-I LOVE the idea of tanker ship and oil rig!
Good graphic-impressive even when camparing with valve's works.
Atmospheric-ways after ways of infected swarm toward survivors as they try to make it to the finale saferoom.

Cons:

4 maps only.

Conclusion:

Very well done.

Pros:

Atmospheric
Good level design

Cons:

Very dark, can't even see more than 6 metres with the use of flashlight.
Sniper rifle become totally useless in utter darkness.
AI have bugs(get struck in wall, pass though walls)
The van on the third level doesn't MOVE at all in singleplayer.

Conclusion:

The campaign needs improvement.