Pros:

story
l4d1 survivors
looting is cool
disaster obstacles 
well made
intro and outtro!
exciting and dangerous

Cons:

should be 2 maps really 
sometimes helicopter animation gets stuck
got lost first time playing
versus bugs

Conclusion:

very exciting map and a fun challenge!, few minor bugs , its like a campaign in one map, which can sometimes be great but sometimes require allot of patience, good luck guys!