Pros:

-I love Minecraft, free points there...
-Keeps alot of the Minecraft fee
-I loved how you had to craft items to continue on.
-Great Opening

Cons:

-The snow and rain
-This is just a nitpick but i didn't like the lighting, i like Minecrafts classic shading than the more realistic shading and reminds me that i'm not playing Minecraft
-Unoriginal, Minecraft maps have been done before.
-So apparently turning lava into obsidian angers Zombies now?

Conclusion:

This is definitely the best Minecraft-based map for Left 4 dead 2, i reccomend you download this and all the addons listed, however the lighting may turn off some and some of the area's are lackluster and uninspired. I have to give this an 8.5 out of 10.