Is this Lucina still any good ?

She will still gain an amazing Atk+8 from her weapon and Swift Sparrow, so it's not a huge loss. She only needs to worry about losing her Speed, which is an important factor for her.

I think she's still worth it esp. since she gets +4 atk/spd with Swift Sparrow in general and the extra stats when attacking melee enemies. She won't hit as hard, but she'll still double more, maybe give her Flashing Blade as seal to proc Moonbow more often.

Those are the same IVs I got. Still plenty usable given her prf wep buffs and possible team support! Excellent boon will more than make up for it.