Pros:

Really good sounds overall

Cons:

The auto-shotgun is kinda dry, and the M16 seems echo-y, but still good

Conclusion:

I really like this, most especially for the silenced machine gun

Pros:

30th Street station - well done.  Loved the reverb/echo too
Bridge rocked too
Very good game flow
Overall good design and detail
I had no clashes with my mods - improved weapon sounds, blood and gore, better bots

Cons:

Not much.  Would've been nice to have a little more width to move around in for the finale, but that's minor.

Conclusion:

I loved the campaign being that it's close to home.  But also because it was just very well done. 
At 8.4 currently, this excellent campaign is extremely underrated. What gives?

Pros:

So much, I'm not sure I can remember it all. 
Loved the prison environment, very realistic
The listing ship in the penultimate chapter was amazing, and novel.
The finale map was awesome, large,very 3D; but  not *too* large.  Also, didn't get lost at the finale with no idea where to go, the balloon rescue was original and easy to see. Kudos!
Super creative environments, better than some of Valve's maps
Falling car!  lol
Excellent attention to detail
Good game flow and navigation
Difficulty, IMO, just right (on Normal)

Cons:

Can't think of anything.. maybe a little Jockey happy?  I'm not rating it a perfect 10 because I don't think anything perfect exists, but this was close!

On second thought, I changed my mind.  10!

Conclusion:

This is easily the best custom campaign I've played, IMO.  Fantastic job guys! If you aren't working for Valve, you should be. I can't believe I waited so long to download and play this one.

BTW, the pictures here don't do this campaign justice.

Pros:

Maps look desolate with litter like a zombie apocalypse would look.
Opening saferoom was neat

Cons:

Overall, maps are rather bland and repetitive
Can get stuck at places and have to restart
No loading bar with wheel, but I considered that minor
I also had to disable ALL my mods, at first, I did just a few,  not sure which one was causing chapter 2 to drop me out of the game. Either the Gore and blood mod or the improved weapons sounds mod.

Conclusion:

Needs some work but has promise. First campaign?  
In Chapter two, I couldn't see the ladder at the end of the long plank that the lift takes you to.  if you drop outside between the buildings, there's no way back.  I stopped playing after that. 
I probably should give it another go.

Pros:

Nice! 
Rocks

Cons:

None

Conclusion:

I like this.  It's not vastly different from the stock music, just metalized up a little.

Pros:

This is awesome! 
Everything about it

Cons:

None, really, except maybe some maps (Back To School) seem to have a problem with this:  but I think it's more the problem with the map than the mod

Conclusion:

I swear this little mod just made L4D(2) 50% more fun to play.  Does that make me a sicko?   lol 
I love the splatter. 
I don't think the textures are too big, they seem fine to me....?
Likewise, the color is just right.  Real blood is not fire engine red, despite what some cheap halloween fake blood products might lead you to believe.  In fact, the thicker and more dry it is, the more brownish it is. 
I agree this should have been an included option with the game from Valve:  "Gore-alicious"

Pros:

Good detail in the prison, believable world

Cons:

Bad navigation for the finale

Conclusion:

The finale tarnishes an otherwise good campaign.  After starting the generator, I ran around for 5 minutes with no idea which way to go.  After I finally discovered the pathway that'd opened up, (and more of that "Get to the copter" with no copter in sight stuff) , got down to and along the stream though an endless hoard,, and I couldn't move up the bank to the copter(tanks don't help) like there was an invisible wall. Everyone died. It's like the opposite of a reward.

Pros:

Great balance of weapons, ammo, and infected
Good navigation
Good finale
Creative design

Cons:

None, really

Conclusion:

This is a really neat campaign, and I liked going through the police station near the end.  Several times I almost died (single player mode, normal difficulty) but always made it to the safe room.   Well done.

Pros:

Great designs and details
Cute tank
Foam finger rocks
Putting the chainsaw right before the stadium stairs, easy to mow your way through the zeds

Cons:

What  #@$% helicopter?    Loses points for loss of direction.

Conclusion:

Okay, this kinda ruined an otherwise great experience for me.  I'm getting really tired of L4D2 campaigns, including the official ones, that obscure the final rescue point when you have 200 common infected, a smoker or two and 3 tanks on your tail.  In the stadium finale, it keeps saying, "Get to the helicopter".  Well, what helicopter?  I don't see one.. I hear it, but I don't see one, anywhere.  I'm running all over the stadium getting pounded and there's no damn helicopter. I have no idea which direction to go.   In the real world, you couldn't miss it.  That's just frustrating.

Pros:

Spooky
Atmospheric
Original and imaginative
Good flow

Cons:

If there are any, I can't remember them

Conclusion:

One of the very best if not my favorite.  This should be in every L4D'ers collection.

Pros:

Good level design and flow
Realism
Didn't get lost like many custom campaigns/maps
Not ridiculously difficult for single player mode

Cons:

Multiple hunters at once?
Had a little trouble realizing the radio at the very end was at the bottom, not upper tier of the platform.

Conclusion:

This is definitely one of the better campaigns out there.  Just download and play it already.

Pros:

Interesting levels, nice artwork and detail, especially in the garage

Cons:

Too many dead-ends and small corridors.
Not enough items for normal difficulty (mostly health)
On the mall level, there's poor direction, very unclear what where to go, and c'mon, no forklift on Earth moves that obnoxiously slow. I couldn't even tell that it was moving at first!   After dying there, it wasn't worth re-playing.
Bots can fall behind easily. 

Conclusion:

This is a neat campaign but still needs some work.