I'm a fan of this series. Admittedly I, contrary to what seems to be the usual method, found it through the gender bender tag rather than despite that tag...
Still, there is very little actual gender bending involved. In fact I would say that I would not read this as a gender bender story, because on that basis it has nothing to do with that genre. Very little is done with the gender switch other than the occasional gag joke. It's mostly one more qualifier, in addition to being near-manaless, in addition to being a child, to make the MC even more 'degraded'. For me the problem with that is that it implies that being female is in itself a degradation, not just on physical strength levels but even simply as a basic humiliation. While characters comment that 'at least you're still human', it remains rather misogynistic...and every other female character doesn't accomplish very much. The blue dragon is a footnote to Karrel, even though the blue dragon should be a fullfledged character in her own right. Mediah, uh, exists? Mostly in order to take care of Lana and then Dark. And Lana, of course, exists literally only to be hated. Every character of consequence is male.
As a Murim/wuxia story, it's somewhat garbage. There's not much interesting development of techniques as they relate to a well-developed system and there are no stratagems in the combat. The qi/ki system is unexplained and the magic system of the new world is the typical visualization handwave. There was a very brief set of beautiful interaction early on, when the mercenaries explained the Remembrance of the Earth spell, which nearly struck a perfect interplay between Dark's ignorance of the new world and all of its own well-designed and thoughtful nuances. However, after that magic received less and less attention. The Titans are also unsatisfying from a mecha standpoint because every Titan we see has a single statistic associated with it that determines its value. If each of these elements was developed then I would be a great fan of the novel combination and worldbuilding.
Nevertheless, I still read this story in a single sitting and intend to continue to read new releases.
In terms of writing, despite all of the negatives that I have said, this series is extremely refreshing to me even though I didn't actually get what I came for (gender bender). While the relative levels of training/enlightenment between the two worlds are somewhat bizarre, the story has very compelling characterization, giving convincing kingliness to (some) kings, strong intelligence and planning to (most) wizards, and admirable loyalty and morality to its knights. The MC himself (for he truly is very obviously a he—this is not actually a gender bender in any but the most superficial of ways) has fortitude and cleverness, a certain kind of wisdom, and very real flaws. He is proud and irritable without arrogance or brutality. (I say this, yes, despite the fact that he goomba-stomped the first graduate he ever fought...) I can buy into the idea that he is seventy two years old and has reached enlightenment. Yet these characters do not remain static. They are given real questions to answer and even if their answers are somewhat flat they are earnest and appealing.
Although the writing is linear compared to greater works of actual literature, among its actual company of webnovel serializations and somewhat shoddy trend-followers and revenge-porn xianxia, this series stands far above those.
