Pros:

Good remake of the original COD5 map.
L4D1 Survivors.
Runs smoothly.
Barricades.
Mystery Box.
Can open doorways like in COD5.
Good details.

Cons:

Tanks come way too early.
Tanks come...nonstop.
Incredibly hard to survive.
Map is nearly impossible with bots, better have friends.
Opening the map up some more would be nice, because you get cornered inside in no time. Being able to go outside would help fix that a lot.

Conclusion:

I think the creator did a good job when it came to making the map exactly like the COD5 version, but it doesn't take very long to get overwhelmed and killed by the infected. However, I suppose the point of survival -is- to see how long you can hold out, and it does a very good job of that, lol. 85/100