Pros:

-Custom survivor dialogue at the start
-Good difficulty, just right
-Really cool locations, with decent variety
-Feels like a L4D2 map, rather than like a port of a L4D map.
-Fits into the official game's canon, in-between events
-Creative finale, very original.

Cons:

-No survivor dialogue anywhere else.
-HDR is all over the place. Lighting in general is VERY poor because of it.
-It's not clear what the generators at the finale do, or why we're starting them. Directions to the opened path would have been nice.
-A lot of crescendos use the default "Rescue is coming, defend yourselves!" text even though no rescue ever comes.

Conclusion:

This is an excellent map. The scenery is beautiful and atmospheric, it's diverse and interesting and the locations and transitions look believable. It has its hard moments, but overall difficulty is just right, making events spot on. It's a nice extension to the original campaign, and fits within events believably.

I want to give this perfect 100, but I can't, not with the atrocious lighting. There's no reason why the game should go pitch black in broad daylight just because I'm under a highway overpass. It looks like HDR adjustments are too severe, making some dark locations FAR darker than they have any excuse to be. Almost the entirety of the first map looks like daytime, but plays like 2 AM on a moonless night.

Fix the lighting problems and this campaign will get a perfect score.

Pros:

-Simply beautiful level design
-Varied environments
-Survivor dialogue is well-placed and varied
-The mall is amazing :)
-Abundance of weapons and supplies, and even defibrilator units
-Clever use of an elevator as a safe room
-Sweet crescendo event at the staircase
-Fun to play and replay

Cons:

-Finale is weird with such a large area to explore
-No ammo dumps at the finale
-No weapons at the crescendo event immediately after the M60 drop

Conclusion:

This was a really fun campaign. The scenery was beautiful and expertly done, the events were quite satisfying without feeling cheap and the finale was well creative. There are enough weapons of all kinds and they feel well-paced throughout.

The only thing that bugs me is the ending, in that prior warning that we may want to press that console might have been nice. That, and it doesn't seem to do a whole lot. The first time I played it, the helicopter came to the pad pretty much as soon as I got to the sliding doors, so going up to turn the lights would have taken longer. Putting in an extra pre-final wave or two before the doors open might make it more worthwhile. There's also no ammo dump at the end, meaning the survivors are forced to scavenge off the various weapons strewn throughout, which is not ideal. Prior warning about the console and an ammo dump SOMEWHERE might be nice.

None of that detracts from the campaign, though. It's well fun and well worth the high marks.

Pros:

-Long campaign with many zombies. The carnage and struggle are epic.
-Good supply of super weapons on various maps.
-Well-designed Crescendo events of all kinds in a variety of places.
-Many types of zombies and abundance of special Infected.
-Clever Tank spawn points.
-Survivors dialogue is well done and appropriate.
-Abundance of weapons and supplies.

Cons:

-Jimmy Gibbs Jr. Zombies at the end are practically cheating.
-Lack of weapons at the end means you can end up carrying an M60 or a Grenade Launcher, running out and having no primary weapon for the majority of the final fight.
-Needs more melee weapons over the entire campaign.
-Several instant kill, unrecoverable locations like being squashed by the lift on the first map or falling into the water before the drawbridge.

Conclusion:

Excellent campaign and well worth its fame. It can easily give any regular L4D2 campaign a run for its money, and it proves for a solid time of entertainment, where other campaigns feel like they're over so fast. The abundance of special resources makes for some interesting encounters when you don't have to hoard everything and fret every round. Aside from the lack of weapons on the finalie, my cons are minor nit picks. This really has become my favourite campaign.

Pros:

-Faithful to the original's feel
-Weather effects add a lot to the experience
-Character commentaries are pretty spot on
-Turret placement on the hospital roof makes it actually useful

Cons:

-Turret placement on the hospital roof becomes a liability for being punched off into a huge drop
-Not enough melee weapons

Conclusion:

An excellent recreation of No Mercy from the original, and made better in quite a few ways. Weather effects really enhance the experience and the new guns are well spread out throughout the campaign. In some ways, it's better than Valve's own conversion.