I expected this legendary banner to suck

M!Grima is on the banner so there is a top tier unit on it.
M!Grima > Hector
My opinion.

Legendary heroes (Ephriam, Lyn and F!Grima) ware known to show up long time ago:
https://fireemblem.gamepress.gg/q-a/october-legendary-banner-prediction

Im very happy with this banner because I dont have many units from it. I would be glad to get any unit from red, green or even colorless pool for fodder, merge or to use. Only blue is miss for me: I have and dont like Ephriam(+atk/-res), dont need Sumia, and already have B!Ninian.

Quality of legendary banners is very subjective. I didnt realy like last banner that much (exept Tiki, Hector, Maribelle and maybe Ike).
I agree that Eirika is strong "meh", but I not exited for most main protagonist characters. They are mostly moslty boring: righteous, honourable (yaaawn!) and painfully cliche.

Scrapping the barrel? with a unit that ranked consistently in the top 10 of both cyls? really?