Pros:

-Amazingly thorough! Such detailed maps.
-Cute easter eggs!
-I've played this map multiple times, but I still found new places to explore this time around!
-There is just so much greatness I've forgotten it all.
-There isn't too much of a guiding presence with the arrows, allowing the players to explore on their own, and eventually find their own way while still enjoying the scenery.

Cons:

- In the nightclub level, the nightclub itself still has the tank sounds behind the curtain, but a tank is not released anymore!
-It is easy for a team to fail if they separate for even a moment on the last level.

Conclusion:

This was a MASTERFULLY crafted map. I adore all of the minute details put into this map, especially the ones in the precinct, at the end of the nightclub level and at the beginning of the last level. This is easily one of my favorite maps. It is absolutely amazing. I also enjoy how you turned the scavenger hunt from L4D2 into L4D1. Marvelous! This is just such a great campaign. I reccomend it to everyone!!!

Pros:

I loved the scenery
Liked the plot
Good amount of weapons
enjoyed the finale map

Cons:

The alarm added on level 2 is impossible, there are alot of glitches getting into the alarm room.
 Was better before 2.6

Glitches where you fall off of the ledges and teleport backward

Conclusion:

Not as good as it used to be. Those kind of panic events are only possible in L4D2, because of melee weapons... The horde was also a bit too large, even when I tried it on normal. (Played again & before on advanced)
Please at least lessen the amount of zombies that come at you during this level. I also didn't notice many of the special zombies

Pros:

Very fun to explore!
Beautiful maps
lots of replay-ability
Good amount of ammo drops
very very interesting theme, haven't been to many decent mall maps

Cons:

Those events to 'hear about the apocalypse'? They never work, Neither does that one to play the piano.

A little confusing to find your way around at first

Conclusion:

I enjoy this map alot, and I play it very often, and I still get lost every now and again! I've had alot of fun with it, and I'm looking forward to your other maps!

Pros:

Adorable! I love Mario and Luigi!
Loved the dead Mario and Luigi easter eggs

Cons:

This was so glitchy I couldn't even finish it, I was teleported backwards and forwards, and fell off of ladders, and a good about of things read "ERROR" instead of actually showing up.

Conclusion:

It's a very great idea, and it would be a great deal of fun to play, if not for how extremely glitchy this addon was.

Pros:

Very challenging, but not too challenging
Beautiful scenery, fun to explore
Such an original idea!
The finale was AMAZING, all those colors

Cons:

takes a while to find health kits and guns at the beginning of the campaign

Conclusion:

Another awesome DLC!
I loved everybit of it!!

Pros:

Amazing scenery
Many alternate routes to take
Extremely well thought through
smooth play through, easy progression
Alot of cute graffiti on the walls and EASTER EGGS!

Cons:

One horrifying glitch in on the level where you have to run into the catacombs, getting stuck on a piece of shrapnel unable to get free with the hordes attacking you non stop

Conclusion:

This was the first addon I ever downloaded for l4d, and I adore it!
It was well worth the download, I play it all the time!