Pros:

*AMAZING ATMOSPHERE
*Nostalgia
*The cut scene after teleporting from that space level to Neo's lab was VERY nice. I've always wanted to see a cut scene in a custom map.

Cons:

None that I know of, but there is a bit of room for improvement. maybe give those robo things on the space level a bigger range of damage.

Conclusion:

Great map, highly suggest that it is played. Room for improvement, but otherwise a great map.

Pros:

Very good additions
Nostalgia
Since I got hacked and lost my original left 4 dead, this is a very good replacement
The laser alarm in the airport was a nice touch

Cons:

Glitchy at parts
Missing textures
At the end when all of us got in the plane, we all fell out of it.
After the original tank had been killed, not a single zombie or tank came after us

Conclusion:

Very good game, filled with interesting new attachments, but lots of stuff can be done to improve it.
 87/100