All right, my turn:
"One Piece tier"
Kaiji, Ookiku furikabutte, Saikyou Densetsu Kurosawa, HxH, Monster, Battle Angel Alita.
Cross Game, I'll, Vagabond, Touch, Dragon Ball, Berserk, Full Metal Alchemist, Giant Killing, Black Jack, Shamo, Slam Dunk, Say Hello to Black Jack, 20th Century Boys, Yu Yu Hakusho, Jojo Bizarre Adventure, Real, Harukana machi he, Ushijima, Nana.
Fist of the North Star, Claymore, Gantz, Welcome to NHK, Parasyte, Ranma 1/2, Great Teacher Onizuka, Battle Angel Alita: Last Order, Dr Slump, Homunculus, Liar Game, Shin Angyo Onshi, City Hunter, Rough, Death Note, Dragon Quest: Dai no Daiboken, Naruto, Major, Wingman, Lupin III, St Seiya.
Cobra,Attacker You, High School of the Dead, Soul Eater, Konjiki no Gash, Fruit Basket, Bt'X, Battle Royal, Cutey Honey, Sailor Moon, Bleach, Black Lagoon,
Fairy Tail, Rave, Shaman King, SDK….
Yu Yu Hakusho is obscenely overrated.
Not as much as Dragon Ball, Fist of the North Star or even JJBA.