User blog comment:B214/Volume 22 spoilers/@comment-95.90.227.198-20170206220903/@comment-31137559-20170209013419

Issei might have mundane roots and a mundane life before he was reincarnated into a devil. But everything after that most gods haven't experienced. Issei has drawn powerful beings to him since the series started. He met the leaders of the three factions of Christianity in two months. Met all the Dragon Kings(except for Tiamat). Fought against and defeated Loki. Met all of the original Grigori leaders. Met all the Satans. Met most of the Longinus users. Has met the wielders of four holy swords. Has met the wielders of the Demonic Emperor Sword(Siegfried, now Kiba) and the Holy King sword(Arthur). Has met the son of Lucifer. He is on a personal level with the two most powerful devils. He got engaged to a high-class devil. Has drawn very unique girls into his harem. He went from getting his ass kicked by a fallen angel with two wings to defeating a Heavenly Dragon-level Evil Dragon. He has met the descendants of legendary heroes. His rival, the White Dragon Emperor, is the great-grandson of Lucifer. He has met the most powerful Evil Dragons. He is friends with the Ouroboros Dragon and she is living in his house along with a lot of other supernatural females. Has met Great Red and combined with him. Had his body remade from Great Red' flesh and Ophis' power. And became a high-class devil in less than a year. What about that is ordinary? He has experienced all those things in less than one year. But you would ignore all these accomplishments and just focus on the fact that besides his Boosted Gear, everything about Issei was ordinary before he was reincarnated as a devil. He has accomplished way more and faced down more opponents than Goku, Naruto, Ichigo, Luffy, and Natsu have in their respective series. And he has done that in less than a year,