The fact we have several pages in this thread filled with smack talk of various Supernovas left, right and center just shows how much Oda failed to make their inclusion into the story meaningful.
Honestly Novas have some accomplishments
Urouge
Took out a Big Mom Top dog
Capone Bege
Ruled the criminal underworld
Dismantle Pirate crews by killing their crews
Killing avengers
Assassinating Pekoms
Sending Vito to kill Bobbin
This man captured Chopper and Nami
Planned an assassination and attempt three times(technically but Sanji gave him the cake so he won't poison Mom)
High ranking mafia enforcer for Big Mom
Bonney
Infiltrated Reverie and Escaped the Marines
Killer
Injured Zoro and assassinated many people
Mastermind of a pirate alliance
High ranking Wano Warrior( Working for Orochi)
Fought Kaido to the very last
Fought Kaido to the very last
Took Big Mom stuff
Made Tamago lose big money and destroys his allies ships
Survived against the Red Hair Pirates
Apoo
Mastermind a betrayal
Injured Kizaru without
High ranking Beast Pirates member
Apoo is so strong that Killer still wanted even though he was ruining their base
Basil Hawkins
Captured Heart pirates
Injured Zoro
Was supposed to be Shichibukai
Has the third highest bounty
Made the Brownbeard Pirates making him rethink about life
Master swordsman
Battler
X Drake
Flying Six, Rear Admiral, Infamous Captain, Sword Member,
Defeated Caribou,
Survived a battle with Scotch,
Stopped a battle between Novas
Law
Became
Shichibukai, Got hearts of poweful pirates.
Chopped up Sad,
Defeated Vergo, Smoker, Trebol, Tashigi, Kine mon
Survived Doffy and Fuji battle until the very end
Battle Hawkins
Eustass Kid
A power player who watched the Caesar incident
Ran a base and had a bunch of ships
Could call powerful pirate captains like Hawkins and Apoo to join them
His base had snipers
Killed many civilians and defeated Dobon
Injured a Sweet Commander
Fought Kaido to the very last
Took Big Mom stuff
Made Tamago lose big money and destroys his allies ships
Survived against the Red Hair Pirates