Pros:

- Very faithful to the game, and includes mechanics from Minecraft such as crafting and eating of bread.
- Seeing references to the community surrounding Minecraft including Captain Sparkles, Hattventures and several other, notable ones which I could not remember.
- Many of the jokes littered about were actually pretty funny.
- Transitions between Nether and the 'real' world were very smooth and offered a great effect.
- All the levels felt like you were walking through Minecraft with the gun-play of L4D.
- It has a very nicely animated opening cut-scene.
- Lots and lots of custom things, from the special infected to the normal infected to the new hud to the brand new health meters its just...  Its too awesome, thats all I have to say, this took my breath away.
- About one hour long, give or take which is much better then other custom campaigns.
- Several side-paths led to other places of the level which you would not see if you just ran straight through.  One in particular leads you to the End dimension, a entirely separate area of the level, but awesome none-the-less and you would never see it if you didn't take a side path.

Cons:

- The Nether in my eyes was rather bland.
- In one of the levels there is a spawn right before a saferoom, which I was about to enter before ten zombies spawned on top of me.
- The fact that there wasn't MORE!  This isn't a real con, this campaign was giant, I just want more of this awesome campaign.
- Snow, while running made my eyes hurt a little bit but this is just a minor squabble.
-  While this con evens out with one of the pros, many of the side paths only led back to the main path, why should I pick right and left if they both go to the same place?

Conclusion:

I'm going to give you a solid 9.8 out of 10.  While many of the cons were small ones they did have to drop the score a small bit.

The cons are not something you should decide on, you should download and play this campaign now, especially if your into Minecraft like I am.