Pros:

Really good when out of connection
If you die they Rescue you ! :D
They handle melee weapons

Cons:

I found none except the fact that you woulnd't play too much offline singleplayer.

Conclusion:

I've tried both versions, the not lead was the first, and I got impressed with that one too. 8/10 as you won't be using it that much.

Pros:

Minecraft-ish models
Minecraft-ish textures
Great with all the other listed mods

Cons:

Some of the weapon textures didn't work for me like :
Normal Pump Shotgun
Uzi

Conclusion:

Awesome minecraft mod I'll give it a 10/10 after all the model's work fine maybe my l4d2 is kinda screwed that it couldn't open the textures well.