This was one of my Christmas games and it's been my current jam on Switch. As a mash-up between Fire Emblem and a traditional Warriors game, it couldn't be better - there's permadeath, the weapon triangle, class weaknesses, pair-ups, supports... if it's a mechanic in the 3DS FE games, it's been ported across to this pretty successfully.
That does raise a pretty disappointing element of the game though - the fact that nearly all the characters included are from Fates, Awakening or the first game in the series. I think Lyn's in here somewhere but she's not popped up yet in the story mode. My hope for DLC adding some of the more niche series has been scuppered too by the fact that it's just adding more Fateswakening and Shadow Dragon characters. Bit of a shame really.
Makes you wonder though if they've plans for a sequel...