Pros:

cool concept 
the school is very detailed 
alot of fun 
long campaign (for me xD)

Cons:

at first the map feels familiar
you get lost easily 

Conclusion:

At the end this is a MUST DOWNLOAD VERY AWESUM CAMPAIGN!!!! 
but i wished that it had more directional hints but other than that a must hav addon (:

Pros:

Cool Campaign
fun
more than 30 mins. long
 

Cons:

Some Infected Bugs
invisible buildings

Conclusion:

Very Fun Campaign saw sum bugs but that doesn't make it bad is very fun download it :D

Pros:

Fun
Lots of zombies 
it'll take like 45 to 1 10 long to finish it so very entertaining

Cons:

when u get to base the zombies tend to freeze 
thats all
i felt lost in sum times

Conclusion:

Very good campaign, fun and entertaining