The moment I finished Edelgard's route and said out loud "that's it?!" was kind of the moment my honeymoon phase ended. Don't get me wrong, the game is good and it will certainly end up on my best of year end list but despite in a lot of ways being an improvement on previous entries it also is over ambitious without the time/money/manpower/skill required to pull it all off which leads to a lot of both big and little things just not feeling quite right.
The biggest of these being the atrocious pacing, Act 2 (especially the endings) overall being a let down despite the story picking up in a good way and game difficulty (you can pretty much blind play Hard without any issues even if you've barely ever played a TRPG before) being somewhat all over the place. You also have some smaller things like the minigames feeling kind of useless and shallow, lost items being tedious and both feeling necessary and not worthwhile at the same time (especially on subsequent playthroughs), quests mostly consisting of shallow fetch objectives, some uneven support writing quality, docked performance wasn't great (at least for me but I played the majority of docked time on 1.0.0 so I don't know if 1.0.1+ fixed this), the recruitment system not being particularly well-thought-out, the class system feeling restrictive, the map design being pretty mediocre etc, etc. Theres more I could list but I think it kind of gets the point across.
None of this ruins the game and I'm still enjoying it even coming up on 100 hours of playtime but it also means 3H will probably easily win my award for 'Game with the most missed potential released this year'.