The Most Unbalanced Weapon/Thing in a multiplayer game.

[The Rockerfly]

Probably the infinite launcher from RE4 or the Chicago typewriter

 

[cl20]

double shotgun from CoD:MW 2

 

[Booze Zombie]

If a gun is unbalanced, the game is unbalanced.

 

[wootsniper]

Playing as the monkey in TimeSplitters 2. So small, so hard to hit.

If you want to mess with a ninja monkey, you've already lost.

OT: There's that thing called "Tactical Nuke". I know it's really hard to get, but still, it's the most unbalanced weapon ever. The difficulty of getting it doesn't make it any less unbalanced.

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isn't tactical nuke from COD MW2?

and yes, it sucks however i doesn't fit the definition unbalanced