User blog comment:B214/Volume 22 spoilers/@comment-95.90.227.198-20170206220903/@comment-86.145.210.178-20170209024922

Well Highschool dxd is a light novel so the author has more time to think up a story to rise up a weak MC while Manga authors need their MC's to gain gain power quicker so they can get to the high action scenes that excite their fans and have less time to think up stories which leads to some bad chapters. Personally I think the good chapters make us love them and the bad chapters get us talking about them. Thats why I love both light novels and Manga.