Pros:

 - Attention to detail - virtually no texture / overlays / skin problems to metnion. For a v1 this is great!
- Maps keep you on the edge with bombs exploding, quasi-destructible environment and damage-causing ligthning :-)
- Random placement & color of alarm / exploding cars
- Realistic explosion effects - indoors lights swap and dust  / ceiling bits fall off
- Excellent talker scripts - unfort not seen on your average addon campaign

Cons:

- Framerate drop in some areas - noticeable only if using Fraps tho...
- Finale may be a bit hard if generator's off in the final stage... KEEP IT RUNNING !!

Conclusion:

Can't really fault it. This is what L4d/2 campaigns should be all about... FUN FUN FUN... :-)