Quite Amazed

I'll try to say what I can without spoiling anything!

Pros:
-Some elements like signs, names, etc. continue here from Downtown Dine.
-Some levels were truly outstanding in terms of sending chills down my spine.  I knew it was just L4D2 and yet I still felt uneasy in certain parts.
-The environment was very interesting and I just had to look at everything.
-The campaign didn't feel too hard and was well paced.  
-I appreciated the AI Director stopping when I really wanted to just stop and look inside the house.  I didn't want to worry about zombies at that moment.
-Custom music really made this campaign that much better.

Cons:
-A bit short, I really wanted more.
-Ending a bit anti-climactic, but I suppose that's why the campaign's called "Dead End".
-Last level was seriously lagging my computer.  Frame rate was probably in the 20s, and some sounds were cut out, but the game was still playable.

I can see the amount of work that went into this campaign because I was just blown away playing it.  Nothing felt out of place, which is good.  I think the strongest point to make about this campaign is just how it made me uneasy and reluctant to move on at times.  I would really recommend playing this!

Pros:

-Love the storyline: flows smoothly
-It looks like Valve made this campaign
-Perfect "dark" atmosphere outside
-NEW melee weapons and custom sounds!!!
-Helix Research environment was very interesting

Cons:

-None

Conclusion:

This campaign is very well designed and I find myself playing it over and over again!