Pros:

-Very Divers Beautiful levels
from a very dark and very Scary Creepy forest(intense)
to  bright light apartment and offices
-Sometimes I got lost but mostly after not more then three tries I find the right way, So that's a Big Pro, because Nobody finds their way at once if you have never been somewhere.
-Just Enough Guns and even found the BIG M60

Cons:

I don't like Unlimited respawning to much and for example: 
Although Going thought the Carpark is really intense the Unlimited numbers of respawning Zombies and Bots that intend to Shoot EVERY car alarm is too much in my opinion 
In the first map where the bridge blows up I fel from that bridge and I was hanging doen screaming for help, but the BOTS just stood there with full helth and everything but they just let me  hang until I fell to my death

Conclusion:

-EPIC
-Made  by a true Master of modding, although the respawning zombies must be taken down a notch (according to my taste)