Pros:

-Everything was well done, good layout and design. 
nice day and night cycle, long maps, it is nice to constantly see the bridge in every area from where you are. 

Cons:

bots seems to shoot past you if there happen to be infected nearby even when in crouching.

no idea what to do with the gnome, carried it till the end. no idea what it does.

Conclusion:

One of my favourite campaign so far. very well thought of.