Pros:

Custom professional-made objects, textures, models, everything! Just awesome;
Amazing music(especially tank music is epic);
Unique panic events;
Not linear levels, multiple paths and even events everytime are different;
Finale area is huge and very well detailed.

Cons:

I had some lags with music(sometimes need to restart level to turn lagging music off);
Little glitches;
Long way to rooftop and if you died you need to go through like 4 huge floors all over again;

Conclusion:

Cool stuff

Pros:

Incredibly detailed every single room is full of details, trash, little objects, even places that you can barely find.
You can choose which way to go.
Great script scenes.
Very dark left4dead style.
Bots arent lagging.

Cons:

Some little bugs on second map;
Tank got stuck on 3rd map in the hole;

Conclusion:

Very very good campaign, much better then this piece of s... Crash course. Maps has charm, that i saw only in original Valve campaigns.

Pros:

Cool atmosphere;
Very challenging stages on expert, and that's awesome;
Finale is creative;
Well-done crescendo events;

Cons:

too many car alarms on 3rd stage;
Sometimes zombies are lagging and run away from you;
I had problems with road texture;
Finale is too hard;
Sometimes hard to find a right way;

Conclusion:

Great campaign that has this l4d1 charm

Pros:

Level design is great;
Good crescendo event in 2nd map with alarm(like in dead center);
Maps are not short and not so long;
Awesome fourth stage, with that half life music;
Not lagging for me

Cons:

My Friend has a purple sky in some stages;
Hard rain effect doesn't fit in this campaign;
Too many witches in 1st level, kinda annoying;
Final is okay, but needs more molotovs\bombs and other stuff, because there're like 5 tanks.

Conclusion:

One of the coolest custom campaigns made for l4d2