Derek Hollan wrote...
Ok,
So, you have a Claymore, a Geth Plasma Shotgun, a Graal Spike Thrower, a Disciple, a Reegar Carbine, a Piranha, a Wraith, and a Crusader. All gold plus the ultra rare and promo shotguns.
Why are you using the Piranha?
And don't give me, "Because the other shotguns suck!" That will just get you ignored. 
I usually don't, I prefer the Talon.
Of the listed shotguns, I like the Piranha more than the others, primarily because I have more fun using it. It's a combination of weight/cooldown, ROF, damage/DPS, and ease of use. But it also some dislike of the alternatives (hence the Talon).
Specifically:
Claymore: awesome weapon, if you like single-shot & cancel-reload
GPS: cool, if you like charging weapons (I don't); seems like a good weapon for others
Graal: another charge mechanic
Disciple: unreliable stun; pea shooter damage; good weight ( how about a damage buff?)
Reegar: great damage, but I'm not fond of the ghost busters streaming
Wraith: ask me again when I have a wraith X ( only a IV now); ROF seems slow
Crusader: weakened by shield gate at higher difficulty; weighs a ton
Eric