Overall I really enjoyed this story, one of the best I've experienced in my history of gaming rivaling the likes of BioWare's Mass Effect and Dragon Age (though BioWare's more modern creations might not hold much water, I reference the older titles) in not only the structure of narrative but character interaction/bonding as well. Atop that, though it may be just me, such an excellent piece of work is all within a Fire Emblem title of all things on my portable handheld Nintendo Switch. That's not to say the story's without flaws however.
One of my main critiques of this route is the lack of dialogue, note I said dialogue not choice. Regarding choice the game is rather streamlined and that's fine, but upon the fork in the road determining if you go Crimson Flower or Church paths the general mindset (or atleast mine) is that you're not comfortable with either choice. I eventually went with Edelgard/Crimson Flower over the Church because despite Edelgard's flaws/poor decision making it paled to comparison to how shifty Rhea was at that point of the game which only had grown bit by bit since her already-shifty beginning at the start. But even if I preferred Edelgard, I noticed there was a lack of dialogue to bring closure between the "betrayal drama" regarding Jeralt's death (since TWSITD did it, ally of convenience with Edelgard), the betrayal/surprise attack itself, and potential bonding over getting over that hurdle/closure. Thankfully such a closure isn't totally ignored (Hubert gives minor exposition referencing Jeralt's death), but the lack of it coming from Edelgard directly until the literal end of the game is kind of a bummer.
Additionally another major critique is the lack of Sothis post-timeskip in Part 2. Like she's the character/reason why Part 2 starts off in the first place in forcing Byleth to wake up. The very least I'd like her opinion on whatever path Byleth took/continued during Part 2 before the game ended. Or is this a thing with all routes in that Sothis is nowhere to be seen in Part 2?
And one really minor critique is the Death Knight plotline. Apparently I've been notified it was some Imperial general and I really wanted to unearth said identity especially when the battle right before the timeskip the dude comes in and starts helping you with Edelgard shouting to trust her and "there would be a time for questions later". Well apparently there was no time for questions because I didn't recruit the right people to actually play the paralogue. Bit of a bummer, but I kinda expected the Death Knight background would be explored by default due to Edelgard shouting that in the middle of a climatic battle.
Anyways, as for what I enjoyed about this story and why. A personal bias (and Japanese storytelling trope I enjoy) is the tearing down of old corrupt/flawed institutions (commonly religious ones) in replacement for a new one. And not only did this game deliver on that but also made sure to highlight the major flaws of undergoing on such a path with being forced to accept the continued ally of convenience that is TWSITD (who killed Jeralt/your dad), having to make a reactive decision between Rhea/Edelgard, and, most of all, having to cut down your own students that didn't have the fortune to be directly under your school House or simply had (valid) uncompromising viewpoints. In general, the feel of accepting the path you already started while doing everything in your power to hold it together/cause the least amount of potential damage is a gripping one, atleast for me. Absolutely loved it.