User blog comment:B214/Volume 23 discussion blog/@comment-77.188.244.180-20170422160855/@comment-3285616-20170422183518

If you think that Issei needs to be smart on top of all tat he's done in order for others to admire him, you clearly haven't read the LN thouroghly enough. I haven't read every single volume, but it's very very clear that Issei deserves a lot of admiration. If he was a smart guy, that would make him far less interesting. A good character is one with flaws but can still be admired. Making him "the smartest" would just ruin Issei as a whole.