Well, I had a random thought, and I think it's time to make a tier list for BL2 Legendary Weapons. Well, here's my opinions on them. At least all the ones I can readily remember being in the game. 

SS: Unkempt Harold, Slagga, Fastball, Conference Call

S+: Lyuda, Quasar, Amigo Sincero, Badaboom, Ogre, Norfleet, Bitch

S-: Maggie, Leech, Hornet, Bonus Package, Gunerang, M2828 Thumpson, Hector's Paradise

A+: Fire Storm, Storm Front, KerBlaster, Bonny, Gub, Baby Maker, Sledge's Shotgun, Infinity

A-: Longbow, Hellfire, Volcano, Nukem, Fire Bee, Chain Lightning, Skullmasher

B+: Thunderball Fists, Invader, Hammer Buster, Flakker, Nasty Surprise, Emperor, Veruc 

B-: Mongol, Striker, Pandemic, Logan's Gun, Madhous

(C): Deliverance, Rolling Thunder, Bunny