Pros:

Great atmosphere.
Things like random fuse locations, store alarms, the light switches and radiation make it stand out from other campaigns.
New sounds and textures.
Awesome safe room music.

Cons:

The tank music starts on a delay. (this might just be in my game so I won't remove any points)

Conclusion:

This is a great campaign, and being a fan of S.T.A.L.K.E.R and Metro 2033 made it even more fun. I didn't notice any bugs besides the tank music. My game did crash around the start of chapter three the first time I played it, but when I relaunched it everything was fine. Hope to see this added to the official campaigns like Cold Stream was.