Pros:

-A dark and daunting landscape
-A challenge for everyone, including veteran zombie hunters
-When coupled with the Informal Skyboxes, and some custom zombie sound mods, this campaign is absolutely beautiful to play.
-I particularly like the return episodes after finding the gascans, the rain and the atmosphere it creates is nightmare fuel
-This mod has made Hard Rain my favorite campaign

Cons:

I've reviewed another of "The Real XX" and I gave a warning saying that it is a very daunting thing for inexperienced players. This goes tenfold with this mod. When I first played this I was scared half to death

Conclusion:

An absolutely brilliant redub of the horrifying Hard Rain campaign. Adds its own level of terror in an almost Silent Hill-esque way. Fantastic and absolutely breathtaking to experience. 10/10