Pros:

-Very nice concept
-Decent visuals
-Quite long
-Nice looking city
-Fun and relaxing playthrough
-Mirrors Edge feel

Cons:

-2nd and 3rd levels were very room to room repetitive
-Zombies were easily dispatched, spawned in groups far enough away to gun down
-Finale felt quite boring
-Bots died constantly on the ledges on the 1st map, had to restart 5 times
Elevator seemed pretty weird, why did it take so long to move one floor? 

Conclusion:

Overall, it was quite a simplistic and relaxing experience. The 1st map seemed pretty incompatible with the bots on the ledges which made me almost want to stop playing, but after that it became more fun. Most of the zombies can be killed from afar before they even reach you, and tanks seemed to have little to no luck too. Also, i'm not sure if I missed something, but the finale event was very easy. Nice looking map though, with a fresh concept.

Pros:

-Minecraft!
-Very professional
-Extremely faithful to the game
-Blast with friends!
-Custom Weapons
-Dead youtubers
-Good puzzles
-Herobrine
-Custom special infected!
-Custom zombie skins!
-Too many to list

Cons:

-Some bugs with the tank
-Crashed a couple of times
-Snow made my eyes hurt when i was running.

Conclusion:

Oh my god, why are you reading this. Screw the minor bugs and download this damn campaign! It is terrific. Get your friends and play it, don't think, just play. It is unbelievably fun, I swear.

Pros:

-Lots of variety
-Well spaced out weapons
-Adds to the Left 4 Dead story
-Feels very professional
-Very bug free 

Cons:

-Double chargers? (See below) 
-Ending was slightly off

Conclusion:

Overall, this campaign is one of the best. It has a unique feel and is on par with a valve campaign. The only problem i encountered was every time one charger spawned, a second would too. Not a big deal but just so you know. Very good layout, nice progression and a compelling story that makes you want to get to the end. Finale was a little disappointing though. Definitely a must download.

Pros:

Very retro feel
Seems like a good remake
Very impressive map designs
Great finale
Intense moments

Cons:

Some difficulty in navigation
A few Audio/Visual bugs

Conclusion:

Thoroughly enjoyed this campaign, I didn't play much Goldeneye so my memory is slightly sketchy, but hey, brilliant campaign. Very intense, detailed and best of all, FUN! Well worth the download. 

Pros:

Very large
Fun
Nice weapon spawns
Lots to do
Great scenery

Cons:

Not really a con, but if you avoid the tanks, you get owned by like five

Conclusion:

One of the best i've played, well done!

Pros:

Very Professional feel
Dialogue fits well
Realistic setting
Good weapon placements
Décor is very good (Especially safe room walls)
Amazing Finale!
Foam Finger! 

Cons:

None!

Conclusion:

Amazing map that really stacks up with L4D's actual campaigns, i'd happily pay money for a map like this as DLC. Probably one of my favourite campaigns of all time, keep up the good work!