You are far from the only one. Most have just resigned themselves to the fact as there's really nothing that can be done at this point. It is what it is. Maybe we'll get lucky and there will some minor improvements on release for lighting and aliasing. But right now this is most likely what we're getting on July 26th.
For my part, I can't get up in arms about an FE game looking rough. The previous 3D games were hardly the bleeding edge of Gamecube/Wii graphics and presentation. And I turn off all battle animations anyway. My main concern (in terms of presentation) is that Three Houses will need better-than-average UI design to deal with all its subsystems.