Pros:

Fun to play
Nice maps
Great atmosphere

Cons:

Bots got stuck few times
Last map with tanks was fun
Shut down the alarm was little bit too long. Finale map start was little bit too long before starting generators. Wasnt nice to play that start over and over again and then die when starting generators

Conclusion:

Few times in the finale one of the bots got stuck (2 humans+2 bots) and middle of the battle ohter bot goes to rescue stuck bot and they were both killed. Netx time bot got also stuck in the finale I we had to kill him to avoid another bot to go rescue him in the middle of the action.

Also summary Statistic after campaing didnt work. All statistic shows 0% exept few things. Total dead infected was also wrong. This can be  Steams fault, dont know.

Just little work and this will be very fun campaing.   

Pros:

Very fun to play
Good balance between spacial infected/tanks/normal infected
Good lenght
Love the graveyard

Cons:

Finale is little bit too hard to play with two player+2bots
No hint where rescue arrives at last map
No special ammo
Finale arena was little bit too big
Safe house in finale: just stay there and soot everything until rescue comes
Train was buggy

Conclusion:

This is very good campaing. It was nice and fun to play. 

The finale was little bit problem. It was little bit too hard compared other maps in this campaing. It took 2,5h to play all other maps than finale, and finale took over 2h and still didnt get thru it. Mostly because rescue arrives, but we have no idea where it is, so we run and run till we died. Thats not so fun. 
Maybe some hint where rescue is and more fuelcanisters.

So little bit work with finale, and this campang is one of the best.

PS. I dont know what version I played, so some of these may be fixed

Pros:

Fun to play
NIce maps
Good balance between maps
Last map was fun and not too hard
Van mission was fun

Cons:

Few too dark areas
AI was sometimes stupid
Intro was nice, but still..

Conclusion:

Very nice campaing and it was really fun to play. Not too long, not too short. And finale was great; not too hard and not too easy. 

Pros:

Nice layout
Fun to play
Different maps

Cons:

Tanks are easier to kill than normal infected (is this a bug)
Finale is waaaay too hard
Not enough infected (exept last map)
Last map (see below)
Last map: not enough close combat weapons, medipacks, throable items
Last map: nonstop wave of infected  

Conclusion:

Nice campaing. It was fun to play, exept last map. It is way too hard to play compared with other maps in this campaing.
Me and my friend (+2 bot players)  played 3 first maps less than 2,5 hours. Last map we played over 3 hours, and we still didnt get thru it.

Last map is basically good, but there should be more medipacks, more close combat weapons like mechete, katana, axe.. And more molotovs, pipe bombs and vomit.
And there should be some breaks in last map. I dont like this constant wave of infected. Few 10-20 sec breaks would be good. 
Those defibs in ambulance are useless: there is never time to use those coz of infinte wave of infected.

I dont know what version I have this game, but I hope these cons are fixed, if not, please, fix those and this campaing would be one of the best