Pros:

Nice level design
Nice events
Good NAV
Possible to escape on finale

Cons:

Author should add some props on places, where survivors can't go due to invisible walls
Should add some hints all around the maps (especially, map 2, where you should go through a wagon and burn cans)
Add more melee weapons on 1st map
Remake rocks in water (1st map), because they're unwalkable (you're inside them)

Conclusion:

Nicely done campaign, I love it. You've made my day, Sir!