Pros:

-level design
-audio effects(creepy crying baby FTW)
-challenging campaign 
-custom melee weapons
-AWESOME RESCUE
-incredible attention to details
-L4D1 common infected
-BEST campaign I ve ever played

Cons:

-textures are at start a bit glitchy(not sure if that is not just my faul-custom skins addons,etc.)
-otherwice...none,its perfect

Conclusion:

at first you have to excuse my English..
So I´ve played this campaign only with bots and I loved it,no big trouble with them,and as I mentioned in pros this is the possibly BEST campaign alongside with SUICIDE BLITZ 2 ever created for L4D2,yes,not just best custom campaign but best campaign ever! Atmosphere is amazing...it is like actually being in a devastated world filled with undead.
I recommend this campaign to EVERYONE,none can hate it,well maybe Francis :D

Pros:

-great sounds,mod works good 
-sounds didnt annoy me after long time of playing
-love especialy SMG sounds

Cons:

-snipers rifles,M60,spas,GL wasnt edited
-pick up sound is a bit annoying but it could get use to it

Conclusion:

If you love GTA4 I highly recommend this mod,shotgun sounds are a bit lame but the rest is better than original Imho.
I would like to hear edited sniper sniper rifles if is it possible or some music from GTA4, for example when you finish campain it would play the gta main theme...neverless..keep up the good work 

Pros:

-well,music of course

Cons:

-I was expecting much more
-music only appears while tank,witch and  after entering     the safe room

Conclusion:

Worth download if you are fan of the movie but like I mentioned,I was expecting more,like some different music in main menu,while hordes or just like that,because the size of the mod confused me a bit,I was thinking like 80% of the music will be changed but it wasn´t.
I must say it was a little disappointment.
(sorry about the  bad english)

Pros:

very detail 
not so glitchy as I expected
badass characters

Cons:

coath is  a little bit glitchy while holding dual pistols
ghosts-rochelle legs are too skiny

Conclusion:

I personaly hate CoD but this skin pack is super awesome,its like playing a different game

Pros:

-music
-L4D1 characters
-textures
-everything I guess :)

Cons:

-nothing ( well one thing maybe..more common infected less special)

Conclusion:

Great fun,my friends love it,we almost cried  when we made it, arrival of gandalf was amazing moment...
IF author can read this....dude or dudes :D you should make survival map about "the battle of yonkers" from the book World war Z