Pros:

-Interactive world.
-Good touch with the crafting and YouTubers. 
-Makes you feel like you're in Minecraft
-Different areas for different effects.
-Good spread of weapons and Ammo.

Cons:

-Finale isn't very hard.
-Zombies bunch up a lot.
-Some areas are slightly confusing while searching for crafting items.

Conclusion:

I love Minecraft, and Left 4 Dead, but since the two were combined, it's just amazing. It feels like I'm playing an upgraded scarier version of Minecraft, but also Left 4 Dead at the same time. It's a very fun, and exciting campaign. If you love Minecraft, you'll love this campaign. 

Pros:

-Beautiful level designs
-Good length
-Original Design

Cons:

-The ending can be a bit confusing to some
-Bots sometimes didn't follow and got stuck in areas

Conclusion:

This is a wonderful campaign, I was actually frightened at some parts. the level designs are just completely and utterly brilliant. In conclusion, this campaign is worth the downloads even if you don't understand the ending.