Pros:

Creative.
Well made.
Riding a train.
Borderlands tank event.
River rafting.
A proper amount of infected at the end.

Cons:

Its kinda short.

Conclusion:

A creative, well made campaign, 4 stars.
(it would be better to have a map before the train where the survivors have to get to the train before it leaves, and maybe a map before that, just to add a little extra play time, that would be worth 5 Star)

Pros:

1: Awesome Tank Music.
2: Good amount of normal infected.
3: Moderate amount of play time.
4: Epic Final Bunker Battle!!.

Cons:

1:Too many Special Infected, There should never be more then 2 of the same type at the same time.
2: What seems like an infinite spawn of hunters at the farm house, spawns should always have an end.
3: Getting over the traffic in the beginning is not clear, hard to spot a truck grill as a ladder, and bots have a very hard time finding there way along the vehicles, they end up teleporting to you instead.
4: oddly placed witch's, they tend to be right in the way and have to be killed to go any farther.

Conclusion:

A very good campaign with an epic ending, 3 Stars.
(I would have given it 4, but because of the hunter issue at the farm house, it kind of makes it nearly impossible to go any farther, i want to make my point and would like for these cons to be fixed)