The first number is comparative, to other Fire Emblem games. The number in parenthesis is a score as compared to video games as a whole.
1 being the worst. 10 being the best.
Shadow Dragon - 3 (5)
The map design was solid enough, mostly, but no writing, no character personality, questionable art (portraits were great, sprites were not), and no reason to give a shit.
Shadows of Valentia - 2 (4)
The literal opposite problem. Echoes doesn't even have bad map design; it has no map design. It's like what you would get if FE was randomly generated. The great combat mechanics and characters are utterly wasted on this game, and the forced ambush/dungeon fights made it an utter slog for me to finish.
Geneology of the Holy War - 7 (8)
The map design wasn't great, but it existed. This was more than made up for by simply impeccable writing, and this was the first FE that I would really consider good.
Blazing Sword - 7 (8)
The opposite of Geneology. Map design was arguably at its best, but we got a basic story, which was helped out by a pretty likeable cast. I don't love it, but I don't hate it either.
Sacred Stones - 8 (9)
Honestly, Sacred Stones was probably my first or second most replayed entry. I loved the cast, the soundtrack, the aesthetic, and the story. Blah, blah, too easy, must punish myself with high difficulty or I'm not a real fan, blah.
Path of Radiance - 10 (10)
Fire Emblem at its best. The maps were interesting visually and mechanically; I still vividly remember almost all of them, which can't be said for any other game. The soundtrack was third only to Three Houses and Radiant Dawn. The cast was immensely likeable in almost its entirety (well, except for Makalov). The plot was nuanced. Transforming characters were actually interesting for once. While the graphics haven't exactly aged well, they looked great on the hardware of the time. I could gush about this game all damn day.
Radiant Dawn - 7 (8)
Should have been the best game in the series. Instead, excessive frontloaded difficulty, some immensely frustrating map design, questionable plot devices and character decisions, and awful unit availability really made it a shadow of its predecessor.
Awakening - 8 (9)
The entry that saved the series gets a lot of hate. But a lovable cast, a solid visual presentation, a compelling (if bloated and at times stupid) story, a sublime musical score, and immense replayability through inheritance really set this one apart. Also, just because a character can solo the game doesn't mean that they have to; the game is engaging if you play as intended.
Fates - 4 (6)
Frankly, I'm tempted to score the game lower because of the sheer contempt this game has for enemy-phase players. Also, the story was atrocious, and Conquest easily has the least likable cast of characters in the franchise. But damnit, they tried.
Three Houses - 10 (10)
They tried, and they succeeded. Three Houses is a masterpiece, and any issues I have with it are frankly nitpicks.
Warriors - 7 (8)
I love it, and I'm tempted to score it higher, but Warriors is a seriously flawed game (especially its roster).
Heroes - $$$ ($$$)
Dollar dollar bills, yo.