it's not well depicted in the manga, but those following the novel will surely like this version, even though it makes our protagonist seem alot more powerful than he is. he's a mage of new age, from a world where the natural flow of magic was so limited, mages had to come up with rules and systems and decipher ancient ways of magic to progress in their non-stop struggle to save the ending world, while staying in the darkness of that world. there's a whole lot more technical stuff behind the logics of magic systems involved in the novel that makes the MC that much more of a talented mage, so now that he is summoned into a world with alot of natural magic around, he can easily cast his skills, though he also struggles with the differences to the old world, as believes in gods, star constellations, etc, are different so he needs to adapt.
alot of critism comes from the more generic approach of the manga, with our MC slowly working on a team (or harem as some say) and only display him as a very powerful mage, which just isn't the case. in case of chuunibyo, there's gonna be a much harder fit later on in the series though. so far, i'm enjoying the ride pretty much.