Pros:

+ Good crescendo events
+ Aesthetically pleasing
+ Large maps
+ Very challenging
+ Good spread of supplies

Cons:

- Bot pathfinding kind of stinks
- Toxic water
- Boat leaves without everyone aboard
- Finale was a bit lacking
- Lack of Tier 2 weapons

Conclusion:

The campaign was well-built and challenging, with few bugs and glitches (most pertaining to playing with bots, if any). Fighting through the tower at the end was a great idea, however the finale at the end was sort of weak. The rest of the campaign was building up to this epic escape, but I honestly felt that the other, standard maps were more challenging.

Other than that, it was a great and well-made campaign.

Pros:

+ Very well made
+ Aesthetically pleasing
+ Great environment
+ Two additional melee weapons
+ Pathfinding was well-done
+ Dark environment adds to the feel

Cons:

- None

Conclusion:

Very well-built and well-made map. Dark environment at night plus the rain adds to the feel of the apocalyptic genre of the game as a whole. Plus the finale was difficult, which made the challenge more fun.

Pros:

+ Very Urban
+ Door to door fighting makes things intense
+ Great use of the environment (helicopters and police cars)
+ Surprise ending

Cons:

- Bots sometimes get stuck navigating through tighter spots

Conclusion:

It was a fun urban map much like No Mercy. For the people who love the urban setting, this is definitely one to play and the finale was lots of fun.

Pros:

+ Very reflective of the original
+ New paths make it different enough from the original
+ Love how you could see the places you went through in the first one
+ Awesome finale, definitely more intense than the original

Cons:

- Some of Crazy Ron's Dialogue get's drowned out by the environment/background noise

Conclusion:

Again, another great campaign. Not exactly sure how Cold Stream became a DLC compared to this one. Loved it, man. Keep up the great work!

Pros:

+ Extensive Levels
+ Great Urban Design
+ Actively Linear
+ Encountered Little (If Any) Glitches

Cons:

- I'd like to see the original (with original characters) ported to L4D2, more or less for weapon/special infected purposes. But, this honestly isn't a con.

Conclusion:

Awesome campaign. Seriously, Valve should play through this and make it canon to the original story-line somehow. If I hadn't downloaded it (and played it on someone else's computer), I probably would have thought that this was a DLC from Valve.