Pros:

Great lengthy Campaign
Space finale just incredible
Physics in space are fantastic
Not for the casual gamer great difficulty
Very original at times 
Some great set pieces

Cons:

second map takes a little dip in the graphics department but not as bad as everyone has been saying
Not much else as its a pretty solid campaign

Conclusion:

A truly fantastic and refreshing change to the norm of what we usually get from these campaigns. Not easy whatsoever which for me is a big plus and also their just isnt many campaigns about like this one at all. Completely underrated and probably due to most people not being able to finish it. I have played some tripe campaigns that are sitting on scores of 8 or higher and this is better than them so for that im giving this a decent score :)

Pros:

Everything 
Detailed
Non linear
all bugs seem to be fixed from the beta
Just incredible

Cons:

Absolutely nothing, this is perfect :)

Conclusion:

Gonna make this one short because everything about this campaign is outstanding. Valve need to sign you up to the team your map layouts our second to none. Easily the best I've ever played. Thank you very much for this one :)

Pros:

Great detailed maps.
Good length of chapters.
Plenty of zombies, never a dull moment.
Locations are outstanding.
Gnomes!!.
The park actually felt and looked like a park.
No lag issues.

Cons:

Wasnt really sure of the locations of the gnomes, was a bit confusing.
Not much items in the saferooms, yet in the finale their was health packs bloody everywhere.
Nothing else.

Conclusion:

A fantastic campaign built on action. The zombies just keep coming making this campaign a blast and great for hardcore players too. Well done on a class well designed adventure. :)

Pros:

only 3 chapters but this is a long campaign.
I thought the detail was spot on, especially the resort spot.
The hotel looked exactly how a hotel looks like inside.
Loved the way you have to manoeuvre over the vehicles was well thought out.
Plenty of car alarms made for a hectic fun time.
Lots of replayability here I am looking forward going through the streets again and the hotel.
Good set pieces.
Finale was great fun and tough enough on normal difficulty.
Good use of item placement.

Cons:

A little bit of lag on first couple of maps but nothing much to worry about.
Was half expecting a huge horde to come out when i was in the middle of the resort by the swimming pool.
Nothing else really :)

Conclusion:

Had a go at this last night as I was looking for something short to play before I went to sleep. But it turned out to last over an hour and twenty minutes, but I didnt care and wanted it to keep going on as the quality of this campaign is immense, and the concept was just incredible. The resort is just so damn awesome. Full marks must go to the creator on a hell of job well done. Easily in my top ten now :) And might I just add that some people have been giving this campaign terrible reviews and its sad to see some of the best campaigns out there now only have a score of around 6 to 7 and a half. Its a damn crime and most certainly doesnt reflect the authors work with such stupid scores.

Pros:

good length.
Very open campaign which is unique.
Very Detailed.
Saferoom not so safe lol.

Cons:

At times not sure where to go.
Some slowdown issues on some levels.
Very underrated unfortunately.

Conclusion:

A very good campaign that has a lot going for it, I enjoyed most of it. just some slowdown provlems and not much more. Its sad that this is so underrated and feels like a crime. But anyway well done and a pat on the back from me. :)

Pros:

Voice acting.
Inside the Dam is fantastic.
Level design is great.
Use of water well used.
Custom content.
Finale is great.
Fantastic set pieces.
Great atmosphere to the whole thing.
Good weapon placements.

Cons:

A.I screwed up now and then but nothing really bad.
Some areas not as detailed as others.

Conclusion:

I found this campaign fresh and interesting. I enjoyed it from start to finish and have played it quuite a few times now and have never had many problems other than the bots getting stuck now and then which happens on nearly every map anyway. The runway was fantastic and the flooded dam chapter is my favourite part of the campaign. This is a great level and I would love to see more from the creator in the future.

Pros:

Outstanding level design.
Incredible fresh ideas.
There was never a dull moment.
Set pieces.
flooded buildings best ive seen.
Finale was absolutely fantastic.
Great optimization.
Feels incredibly professional.
Theatre house was exceptional and fully explorable.
Easily sits among the cream of the crop.

Cons:

The only con is the con artists giving this a bad score this campaign is without doubt nothing short of incredible.

Conclusion:

Without doubt one of the best l4d experiences ive ever had. Will definitely be keeping this in my add ons folder. The creators should be very proud of themselves as they have created something truly wonderful. :)

Pros:

Nice original idea of heading through a huge underground system.
Light is optional.
Well designed level (would fit in well with Valves levels).
Original survivors.
Good length for campaign not too long or short.
Can get quite creepy at times.
A.I was absolutely perfect which is nearly impossible for any campaign (kudos for this).
Weapons spread out well.
Train station looks fantastic.

Cons:

Only real con would be difficulty is easy but this is minor and is mostly due to narrow corridors easy to take out a lot of infected.

Conclusion:

A fantastic campaign that takes the player through great original locations. Quite dark (if u want it to be) and scary atmosphere makes this a good stand out campaign. Finale was a bit easy but overall this is a campaign worth keeping.