Pros:

My favourite MLP song
Totally fitting with the swearing tank mod
makes the tank not so scary anymore

Cons:

TOO DAMN QUIET >_< i can mostly only hear the first few tones to notice that a tank is coming (-3,5)

Conclusion:

very nice idea,but way to quiet :S

Pros:

-Funny
-Zombies sound now more like real Zombies

Cons:

-Can't hear quotes in crowds (-0.5)
-Can't use in Multiplayer! (-3)

Conclusion:

Good for everyone who thinks that the CIs are boring or are scared of them.