Pros:

Not a lot of navigation errors.

Not to long, not to short.

Cons:

The intro video flows very badly. Try making the camera move more slowly.

Avoid using invisible walls. Instead make it obvious that "a-big-object" is blocking the way (and then use an invisible wall inside of the object).

Props being placed inside of other props, clipping.

Parts of the campaign are very flat. Try introducing more height differences.

Room, corridor, room, corridor. Try breaking the monotony by creating other kind of environments.

Rooftops. They totally destroy all balance in versus. One charger and the survivors has lost one (if not all) of their members.

Curious: why use street lamps instead of floodlights at the stadium? They look out of place.

Conclusion:

The biggest annoyance was all the repetition of spaces. The most entertaining aspect was the travel over the roofs. The roofs didn't work in versus. In campaign they worked fine. They forced the survivors to stay cautious, and work together in order to survive.

Pros:

Not many navigation problems.

Cons:

Infected attacking the start-position although the match hasn't begun.

No startweapons.

Many of the lights are unnaturally yellow.

Other lights are not turned on, but still emit light.

The alarmed car should be easier to spot. The challenge is to avoid shooting the car, not to detect it.

Some of the cars don't have any insides (steering-wheel and such).

Many of the large areas only exist outside of the main-way, try to work them into the map.

Instead of locking the doors, barricade them. It's annoying to have to run up to each door and check if it's locked or not. Especially when it's doors which normally are destroyable.

Conclusion:

I reckon I will see if it become a better map when it's done.

Pros:

Very beautiful maps. None of the props feels overused, all have their place.

Unique events. The bride and the train event were especially memorable. Great fun to play through!

Cons:

The weapons at the start-position only have 1 weaponcount. Two players don't get any weapon.

Infected getting stuck in objects.

Lack of first aid kits. Making the campaign very frustration as several spots.

Fuel problems.  It was very hard to figure out how the event with the fuel cans was supposed to work.

Conclusion:

A very fun map with many interesting ideas. Especially the events were great. Anything bad? The campaign is were heavily skewed towards the infected team in versus. To long maps with to little equipment, to far apart.

All in all, great map, great fun.

Pros:

The forklift staircase idea felt new and interesting.

No game breaking issues.

Consistent environments.

Cons:

Very long intro. Annoying in versus.

Zombie hordes getting stuck behind un-destroyable doors.

The beginning feels like an labyrinth.

The alarm never stops ringing, although the zombies stop coming.

Alarmed cars not looking like they should do. Making them harder to detect. This is not optimal in such an already difficult campaign.

Infected having problems with the handrails, getting stuck behind them.

The AI bots can't handle the forklift event. They jump down the hole, killing themselves.

In the last saferoom each weapon only have 1 in weaponcount.

Conclusion:

Very, very large map. Some parts of the map are really boring due to this. The street-part is really long and really flat. Making it a very boring part of the level.

I believe that the biggest problem is that I played this map the last day. And know I have a hard time remembering anything about the campaign except the notes I wrote while playing. The campaign doesn't hold many memorable parts.

All in all? A good map.

Pros:

Very beautiful environments.

I love having the plane fly so close. Added very much to the atmosphere. 

Cons:

Infected attacking start-position.

AI having much  problem navigating the environment. 

Many of the bridges are to harsh for versus-mode. They force the survivor to re-run ca. 3 minutes in order to catch up. And the survivors are really easily dragged down from them.

The music in L4D is there for a gameplay purpose. The HL 2 music works against this purpose. Adding it is redundant.

The holes in the hospital, the AI experience trouble navigating it.

Conclusion:

It's a very beautiful and fun campaign to play. The biggest problem is the setting, City 17. The games are created to be easily traversed for one player. Not four players. Due to this many of the environments feel to small when you traverse them with your fellow players/bots. Overall, an fun map that I'd suggest anyone who likes L4D2 to give a chance.

Pros:

A lot of interesting panic event.

The flooded graveyard was interesting.

Most of the environments, events and such work.

The leaning bridge was an interesting ending to the bridge event.

Cons:

Objects stuck through terrain.

Start-position not working properly; the infected are attacking although the match haven't  begun.

Tree growing over the ground.

Invisible walls instead of terrain blocking map edge at some places.

Terrain clipping with other terrain.

The balance is broken. A tank can spawn two minutes after the start. Only giving the survivors pistols decides this fight before it has begun. 

Yellow light bulb, red light.

Some areas need cubemaps; purple lightning.

Avoid using decal windows in saferooms.

The environment changes between the maps feel unnatural.

Brick house with supports made of tiny tree columns.

A lot of times the bots will try to destroy an unbreakable door. Nullifying the threat of the horde in many places.

The powerplant doesn't fit the environment.

The trees growing in the middle of the road looks unnatural.

Some areas allow the player to get stuck. These require more or better clip volumes.

The AI couldn't handle the boat-event.

Light without light-sources in some of the rooms.

Tanks attacking at specific places in the level. The falling boulders. Removes the important random spawning of the tank.

Turned over cars in bizarre places.

The boat at the bride gives the impression that it could be used as an escape vehicle. Make it obvious that it can't be used as such.

Conclusion:

Overall an good map with a lot of interesting ideas. The map suffers from a lot of small errors that could easily be fixed.