Pros:

You can skip the intro (just start at level 2)
There is quite a bit of detail in the levels
The bots usually get into the elevators (that's a first on a custom campaign)
The custom pistols, hunter and boomer bile look awesome
Awesome custom music

Cons:

There is no reason whatsoever to view the intro at all
You waste a LOT of time searching for items
I got hit on several occasions while a cutscene was playing
Did I mention that you waste a lot of time searching for items?

Conclusion:

I just played it for over 3 hours and most of the time I was searching for items which wasn't fun at all. At level 6, 2 tanks spawned and I died and I simply quit the game and deleted this campaign because I lost all will to continue playing. This map is probably only fun for people who have played outbreak before, because I haven't played this game and I certainly didn't enjoy this campaign.