Weapons in games that you feel kind of bad for using?

As the title states, what're some weapons that just make you feel "I shouldn't be using this"? Whether its what it does to enemies, what you have to do to get it, whatever.

Metroid Prime has the Plasma Beam. In the 2D games, the Plasma Beam pierces through enemies. In Prime however, they changed it to be heat based instead. As the last beam weapon you get, the Plasma Beam is incredibly strong, with most shots that don't one shot enemies setting them on fire. But the worst is the charge shot, which turns enemies to ash. Still really good, but damn.

Some of the Stands in 7th Stand User are kind of fucked up. Carpenters can literally disassemble people like furniture. Deep Purple can create poison gas to suffocate enemies, along with causing explosions. Miracles can make enemies go deaf and blind, along with making your own body start attacking itself. Red Garland can directly punch your soul. Adam Ant is swarm of insects that can eat enemies alive. And Ocean Blue lets you kill enemies by shooting a high pressure stream of blood at them, or by sucking the blood straight out of them.