Pros:

I enjoyed the gas station creating the forest fire.

Cons:

Error: Flow is Broken - Director cannot populate world (still exists) - 1
No intro (no pts removed)
No dialogue (no pts removed)
Ending area was too large, made it way too easy -1
Tanks spawned a mile away in a wide open area, they were flattened before they even reached us (no pts taken, part of the ending area easy score)
Enemy AI Nav was broken at the finale, multiple jockeys and even a tank were stuck on a pillar near the beginning of the parking lot entrance, on the right hand side if you are looking from the military vehicle -.5
If you stand ontop of the military vehicle, there is no way for the mobs or the special infected to get ontop of it, so you are in no danger at all. -.5
Tunnel in the parking lot at end on the far side from the military vehicle area has an invisible wall at the end, if you walk to this wall and try to continue down the path, you become trapped in this wall. Game has to teleport you out of it after a few minutes of being stuck. - .5
Bots would not leave the safe house, no nav up from the bunker, had to teleport to us near the road from the swamp area. -.2
Radio is a bit hard to find -.2
Felt very short -.1
Load screen uninspired (no pts deducted for personal taste)

Conclusion:

Short and boring, unfortunately. The natural disasters had little to no impact on the gameplay. It was very quiet, the mobs added no pressure or difficulty to the map, and the finale was dull. 

It needs something more than the gas station flash fire to give it something unique and make it stand out. If you let me know when you make major changes, I will be happy to adjust this review.