Pros:

Great flow
Awesome visuals (like skybox and the explosion)
like I said before, UFO and explosion nice touches
Good obstructions so that zombies can spawn easily, and enough interesting things to make the map feel right.

Cons:

None really, maybe just make the electricity lines surrounding the stage a little less thick.

Conclusion:

A good revision, yes sir. Maybe add some railings to the tower, it feels like its lacking.
Great space map sir.
I look forward to seeing more from you.

Pros:

The custom music was a great addition
The scenery in the first and second levels were awesome.
The little thing you did right before the saferoom on the fourth level was brilliant
Very innovative, I liked it all.

Cons:

SO MANY TANKS ._. You really expect me to fight all of these?
The fourth level had a great bot problem, they were always falling off. I would catch a ledge a few times in places were I was supposed to go.
Why would I activate a button to a door if Ive already been to the other side?
You could've put at least cubemaps in, even if it is a beta
The brushwork starts to waver around level 3

Conclusion:

Even with all those cons, I really enjoyed playing this campaign, even if I had to kick every tank outta the game. (Seriously, lower the number. 3 tanks is enough)
The custom music set the mood, and the finale was unique. (Although a bit small and easy to survive)
Why do the doors break and disappear like that? I dont know.
But this campaign is throughly unique and very nicely carried out.

Pros:

Custom conversations are great
The fire effects are top notch
Good visuals

Cons:

There arent easy accessible supplies for finale
Does the alarm for the security check ring forever?
You can never hear the conversations of the pilot to the survivors over the gunfire and whatnot.

Conclusion:

A great campaign, with awesome effects and cool custom sounds. The finale could be worked on a bit, but overall, this campaign was just awesome.
Listing the yeti tank skin as a Con in any way would be unfair, since its not the authors fault the way the VPK system works. Its just unchecking a box, how hard can it be?
A cool play for you and your friends.

Pros:

Great replica
Even better events
The dead air plane crash was an awesome addition
It all flows beautifully

Cons:

I tried really hard to think of one, but there really isnt anything you can pin down on this campaign.

Conclusion:

Another great addition to anyones addon folder. Great to play online with friends, and if you've played half life, you'll definitely remember some spots.
Even if you havent, this campaign just feels right.

Pros:

Custom music
Custom sounds
Custom BOSS FIGHT!
Very innovative gameplay, one of the best.
The witch building was so creepy, and the replayability of the map changing the clues and paths is great.

Cons:

Sometimes you just CANT find that last glyph.

Conclusion:

Brilliantly realized and beautifully carried out map. If I saw the creator in real life, I would shake his hand for such a great map. Heck, I would bow down to him.
Definitely play this.
Go click download. NOW.

Pros:

The atmosphere is brilliant
Epic rebuilding of the first silent hill
Custom ragdolls
Cool game events
The UFO ending was the best ending to a l4d campaign EVER.

Cons:

The transition to the otherworld couldve been done better.
You get tunnel vision in the otherworld. Maybe place a few red lights, even though its not true to the game.

Conclusion:

Not only sporting custom ambience and a direct replica of silent hill, it also works the atmosphere and has great puzzles. I also wonder how you did those words, they're very creative and help point me and my friends to the next goal.
The zombies tend to get in the way of the real puzzle solving. But me and my friends were definitely uncomfortable in the otherworld spaces.
If you like horror, or even not, this campaign is a MUST PLAY.

Pros:

Very fun environments
Cool events
The finale was very innovative

Cons:

None

Conclusion:

A very good campaign not only gameplay wise, but also visually. It doesnt matter what version of the game its for, its good in its own way. A definite must play with friends.

Pros:

Custom music
Cool scenery
Nice choice of fighting or watching

Cons:

The environments couldve been a bit more detailed
The sound clips sometimes play over eachother
When going up ramp for the guantlet finale, the zombies are incredibly easy to avoid.

Conclusion:

Awesome map, the custom sounds totally sells it. The awesome choice of fighting or watching comes with new areas and a guantlet to shake things up. Although at one part I got lost, it was simple to find your way around.
Very unique, and definitely worth a try!

Pros:

Innovative gameplay
Fun bosses

Cons:

Small area
Puzzles are too easy

Conclusion:

This map does alot of things none other has done, and for that, I give respect. The puzzles were quite fun to solve, but a tad too easy for most people.
The final bosses were particulariy fun, aside from the zombies rushing at us while we fought.
Very innovative, and a must play for anyone that loves new gameplay.

Pros:

Custom music!
Huge map to play around in
The environment is very believable.

Cons:

Once you're in the castle, you can hold out for as long as you want.
Tank music overlaps custom music

Conclusion:

I probably spent over 5 hours with my friends messing about in this map, but we never played legit.
Mostly because we had 150 zombies coming at us.
There arent any escape routes once you get to the tower, so I guess its like a final stand. Pretty cool in its own way.
The tank spawns and witch spawns are very annoying, though. If they are fortced, I'd recommend turning them off. Sometimes, you just want to see a gigantic zombie horde rushing towards your castle's gates. :)

Pros:

Very nice visuals, it all flows nicely
Hard to get lost
Good item spawns

Cons:

Cresendo events are a bit overdone
Finale battlefield seems too small
Finale and cresendo have spots that make it easy to hold out

Conclusion:

Overall, this is a great campaign. It really does feel like a boat/oil rig, and it has a nice length.
Although the cresendo events you picked are tried and true (Use generator to open door, use forklift to make bridge)
They tend to get boring. Maybe throw something new at the players.
I liked the explosive barrels too. That one room around the end was a killer.
I was disappointed that you cant fight on that giant tower, you can only grab supplies from it. Incorporating it into that finale could have made it so much better.
This campaign is a must play, with your friends.