Pros:

Very Challenging
Lots Of Surprising Stuff
More Custom content
i liked the buttons if you hit the wrong one you fall
and the twirl thing lol the tank got spun around and was easy to kill.
-SUPRISE WITCHES

Cons:

You die to easy even on Normal
To many Tanks in tough places
Chapters are way to long to survive with little supplies
bots dont help you
bots walk into the traps all the time
bots get stuck
very hard to find weapons and health packs
just pistols on the first part?
no health at beginning
pills?

Conclusion:

This is a good camoiagn that needs alot of fixing and attension. the game even says "this map is unplayable". this person needs to fix glitches and make it a little easier just to get through the maps it doesnt have to be absolutly impossible to get through. and make the chapters shorter one would have taken hours and not many people play Add-On Campaigns so it's hard to get 4 People. Over all i love this map because its very hard to beat by yourself. Expert forget it with the Campaign id give this Campaign 3.5 Stars

Pros:

The maps were long and full of surprises
Good A.I Spawn Points
Nice sence of Direction on where we are(Not like appear in a building and walk into a hallway and your in woods when your in the middle of the city)
Nice and Challenging

Cons:

The Ending has a glitch we succesfully got on the escape vehicle and then we deid?
bots become stuck now and then
last level was hard to figure out

Conclusion:

This campaign was good i say if you want to really challenge with it go for Advanced Difficulty, i had to restart a few times but this campaign i think was really good and had alot of effort put into it, i loved the finale nice to have something diffrent then a vehicle pick you up

Pros:

Very Good campaign.
Reminds me of Half Life 2
Excellent Detail
Not Bad A.I

Cons:

Maps Could have been harder.

Conclusion:

This is a very nice campaign. lolz it reminds me of when i played half life 2 great game also. and next time make your maps a little more Challenging but thanks for making it Left 4 Dead Compatable