Pros:

Portal Easter Egg!!!!
Lengthy campaign 
tank skins!
foam finger melee weapon
nice saferoom on a train

Cons:

none that come to mind

Conclusion:

The portal easter egg which i found out after someone showed me was great. with the portal level design and testing initiative. plus theres cake! and gotta give the foam finger melee weapon some props. definately worth keeping and playing through over and over again.

Pros:

Thoughtful with use and creativity
Thought the ambulance was genius how we had to follow it
loved the vending machine idea

Cons:

Somewhat difficult finding the right path
few med kits in the beginning but we managed

Conclusion:

Great campaign! I Didn't really use airstrikes for tanks since we were on gib fest. fair amount of grenades to tanks. I wish we had more gas cans and propane for use.