Some reviews have questioned the MC.That there is no reason for him to be from another world(I mostly agree) or for that matter an adult . However, it is used to explain away why he is so knowledgeable for his age, why he so mature and how he is adept at some skills. In a way it is a power. The story lacks any challanges for the MC. He aquires so many overpowered talents that from these 1st 2 books he is a Superman without a Kryptonite flaw that we have seen, as of yet. The fight scenarios seem to be made from someone without any real knowledge of melee skills. The Mana or magic system needs to be fleshed out a lot more. Instead of broadening world he should delve deeper into mana/magic system and give this MC some quarks.  Travis Baldree does a great job and does what he can with the story he is given. It is the only reason I finished the book.