Pros:

What can you say............Absolutely Brilliant !!!

Cons:

Small train bug in final

Conclusion:

Should have said it earlier..............Absolutely bloody brilliant !!!

Pros:

Long Campaign
design & crafting excellent
Bots behaved themselves
Expectant atmosphere and good horde events
Sparsley placed ammo and goodies makes a challenging task and introduces a bit of tension

Cons:

Not impressed with flying car finale.......
tends to spoil it. 
simple helicopter would have done

Conclusion:

This is an excellent campaign, and an obvious lot of hard work has gone
into it.
It is without doubt one of my favourites.
The replay value alone is worth a 10.

P.S.
I just cant believe this........At the time of writing this,  the campaign was playing perfectly well.
Valve then decides to 'Update' L4D2 and now there are big red ERROR blocks all over the place.
It's totally screwed with your campaign.
What a firm!!!

Pros:

Attention to detail
Good Flow
Good lighting
Right amount of supplies well located
length of chapter good

Cons:

Bots occassionaly do their own tyhing (Not bad)
small fr issue surrounding forklift

Conclusion:

This is brilliant and worthy of a high score. 
The replay value alone is worth a million. 
Well done and thanks for all your hard work

Pros:

Attention to detail.
Smooth flow of Chapters.
Bots Navigation very good.
Great Atmosphere and just right amount
of ammo/weapons.
Great portal to L4D2 (Original Excellent as well)
Some very hairy moments to cause concern (LOL)

Cons:

Couldn't find or worry about !

Conclusion:

WOW ! what a campaign...relly loved this one.
Its obvious a lot of hard work has gone into this, resulting in a campaign worthy of a 'Valve' tag.
Its fast flowing and thoroughly enjoyable, and the replay value alone makes it a campaign everyone should download.
Thankyou for your hard work and success in any future projects.

Pros:

Attention to detail is amazing.
Very atmospheric, genuinley scary at certain points.
Seamless flow. 
The bots actually worked quite well.
Enough ammo and health without over doing it.
Re-play value excellent !
Very, very good original campaign.

Cons:

None I could find

Conclusion:

What a terrefic experience, and certainly worthy of a 'Valve' tag.
I played it several times over a week, and each time was was great fun, and different.
A brilliant campaign of the highest quality.
Constructive criticism...........Throw another Tank in at the finale........keeps 'em on their toes.
Thankyou for the hard work.....and well done!

Pros:

Attention to detail.
Flow of the game....excellent.
The Scavenge at Finale time.

Cons:

Bots wouldn't get on Chopper in finale...all dead LOL
Lack of ammo and first aid,

Conclusion:

This was excellent and I really enjoyed playing. It was certainly challenging both in directions and fighting,
Thankyou for all the hard work

Pros:

Wide open spaces.
Plenty of room to move and fight.
Just enough ammo & Medkits.
Good Bot navigation.
Good detailed maps.
Plenty to explore with alternate routes.
Great replay value.

Cons:

Couldn't find any.

Conclusion:

This was a well put together campaign, and immense fun to play. Obviously a lot of hard work has gone into this, and I can honestly say this was well up to Valve standard. Well done and I hope you continue in this vein.
(Perhaps a port to L4D2 in the offing)

Pros:

Loved the effects of fire & rain.
Quality of maps...well up to Valve Standard.
Just the right amount of swarms & hordes.
Good amount of ammo and weapons.

Cons:

None that I noticed

Conclusion:

Its all been said: This is an awesome campaign and well deserves the high ratings its getting. L4D1 was a good map, and I think this is a better version. dare I ask you to do another one, say based on a previous Valve release.
Keep up the good work. Thoroughly enjoyed it!