User blog comment:B214/Volume 22 spoilers/@comment-95.90.227.198-20170206220903/@comment-31137559-20170209160409

I understand where you coming from. But when I see comments like that, I'm thinking 'what more do people want?' He has already has his body remade from Great Red's flesh and Ophis' power and they are the two strongest beings in the world. And what I meant by faced more, I meant the fact that he has experienced all these things in less than a year. Dragon Ball Z had all these time skips and had less enemies than DxD. Issei has faced down all these opponents and legendary mythological figures in history in less than a year. The extraordinary thing is that Issei has met and fought against legendary figures from different mythologies in just the span of one year after being reincarnated into a devil, learning about his Sacred Gear, and learning about the supernatural world. He has done that in so short a time that it is extraordinary. And also developed his harem(although it isn't complete), went from low-class to mid-class to high-class devil, and has gotten very powerful in less than a year.