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. 
Cheers

The Piranha is used because :
-It's light
-It's easy to use (Full Auto with decent RoF)
-It does great DPS if all pellets hit (meaning Smart choke and an accuracy boosting class is the best way to use it).
Now let's compare it to other shotguns :
Claymore :
-Weighs a ton.
-Very powerful with great DPS if Reload cancelled.
Therefore not 'easy' to use for 99% of the MP population.
GPS :
-Okayish weight.
-Powerful and stagger with good accuracy even without smart choke, and homing projectiles.
-Doesn't go through walls/armor.
-Charge mechanic.
-Lag dependent.
As such, it won't be used that much because it depends on the connection with the host, people can be turned off by the charge mechanic, and the fact that it doesn't go through armor.
It's seen sometimes, but it's usually because the user is host.
Graal :
-Excellent shotgun. On host. I won't go through the details but the slightest lag can make the graal very hard to use. Can't penetrate cover either. If it was hitscan, I can guarantee it would be used by
a lot more people. But it would also be kinda overpowered.
People never use it.
Disciple :
-Horrible damage and unreliable stagger. I use it to mix things up but no point using it in any 'serious' run. People never use it.
Reegar :
-The ultimate flamethrower

. The range cap & low ammo kinda balances it. But AP ammo IV or Incendiary IV can make it incredible against any faction.
Crusader :
Eh. A sniper rifle disguised as a shotgun. Vey heavy, very accurate. Can be hard to use if you're not a good shot.
So power users won't use it, and weapon classes have better choices (Saber, Paladin to name a few)
Wraith :
A decent shotgun, lightweight and decent trashkiller, but the abysmal RoF makes its use a no-no for plenty of players.
Now you know why people use the Piranha. Buff the Disciple and the Wraith, and if it's possible try to fix the lag-related problems to the GPS and the Graal, and you'll have a lot more variety.