Pros:

*Stays true to the Left 4 Dead series.
*Captures the world of Minecraft extremely well.
*Lots of zombies throughout the entire campaign.
*Tons of characters from both L4D series and other video games to find.
*The use of crafting during the campaign is a nice touch.

Cons:

*The small crafting segments might be confusing to some.
*Finale is very easy.
*When zombies come into a room through the doors they are pretty susceptible to a just a few shotgun blasts.  This can make some parts of the campaign feel extremely simple.

Conclusion:

All in all I really enjoyed this campaign.  The level design is quite remarkable, especially considering that it had to keep the feel of both Left 4 Dead and Minecraft.  Even though some parts, especially the finale, feel a little too easy it's still the most fun campaign I've ever played.  This campaign should not be missed by anyone and can truly be appreciated by any player familiar with either series.