Pros:

+ One of those maps where it feels like an actual campaign made by Valve.
+ Detailed, good textures.
+ Though i didnt understand it, custom voice acting.
+ L4D1 survivors.

Cons:

- Was that rescue guy even speaking english?
- Special infected sometimes got glitched.
- At the catacombs, you can get stuck while jumping down the hole.

Conclusion:

Overall, a good campaign. I'd more than likely do it again if i had the chance.