I'm a long-term lover of Fire Emblem, and the only reason I'm not giving Engage a 1-star is that it has some of the best combat mechanics of all the Fire Emblem games.
Why should it be a 1-star:
Zero character story/ progression
The story is non-existent.
The gatcha mechanic is run, and customisation is great, but it's not enough to support a storyless and emotionless game.