Pros:

nice long maps
well detailed 
nice balance of ammo
creative use of props and barricades
fun gameplay
easy to follow
wall/math puzzle

Cons:

invisible walls not needed
lack of proper cutscene for the getaway
i got sand in various places ;) (j/k keep it!)

Conclusion:

A fun short campaign (4maps) but i highly recommend downloading this!

i like military mods like this: well thought out, well planned and well executed.

The run from start to finish was just long enough and exciting enough to keep the player in suspense and wondering what's around that next corner.

The finale battle was... let's put it this way, colorful hehehe nice bit of coding there. first time i've seen this in a mod.

took away some points b/c it coulda used some more ammo at the end, it wasn't so much that it was difficult, but more that there were so many hordes at once, which i love of course but i kept running low on ammo through out the whole campaign, and that isn't part of my plan. Maybe some goodies strewn about the finale cave could balance that, gas cans, pipe bombs, mols around "the object". 

if you make this for l4d2 i definitely want to see melee weapons and grenade launcher near wide open spaces (sand) and the M60. it would go well with the decor, hehe

When the battle was over, it seems as if it needed something to commemorate the ending, maybe some explosions, or a rescue as an end cutscene, i think it deserves that.

I took away some points for a couple invisiwals that shouldn't be there (map1 cars and house) and if you add a tad more ammo/goodies at the finale battle, it could reach 100 and i don't say this often. 

But all in all it's a great mod, Kudos Kev Edwards, i give it a 95.

This is one that goes in my watchlist. A definite download for everyone !!