Not a fan of it at all. Story is mind-numbingly boring at best and a travesty at work. Art style is way too overly gaudy for my taste, and this is honestly the first time that I wasn't impressed with a FE OST.
And to be honest, even the gameplay isn't that great to me. I'm not a fan of the switch to a hyper offensive style of play and subsequent weaking of enemy phase play. Was also not a big fan of the constant enemy reinforcement spam, especially on later maps.
Also didn't like how much more difficult it was compared to most of the previous games. It's the only FE game I still haven't beaten because of how unfairly difficult the late maps are, even on Normal.
The game's economy with how money and materials are handled is lousy, unit balancing is out the window with just how badly early game units are outclassed, and I prefer the old style of the weapon triangle compared to the break mechanic.
So yeah, almost every change was a downgrade in my opinion.