Pros:

Everything

Cons:

Streets too shiney in spots
Can be too easy at times with excessive throwables

Conclusion:

I never did ge the chance to play this for L4D1 so I can only go by what I've seen here. The campaign is outstanding. The events, the effects, details. The storm and fires kick some ass, was very fun to play. The way you could be in a destroyed building.  Be under shelter 1 second, then step over and be below a destroyed floor, having the rain come down on u in that spot only with rain sounds playing accordingly, good stuff. Nice custom music, the whole place is creepy but the music makes it creepier. Awesome job, looking forward to more!