Where do you guys rank the robins refines?

Theyre just raventome+spectrum tactic.
Both of them.

The refine is itself is neat but the new weapon is average at best, i wished something more than that. I guess owl + CC is best set up for both of them.

Meh.
Navarre still rules.

The refine is certainly good but the units themselves are still quite poor. I don't see myself ever using them for more than a bow counter in AA so I'm not spending dew on them.

I like units who buff, so I like the idea of the refine. However, I'm already working on a +10 Titania for tactics buff (and I think she is better for that role - she adds +6 to 3 stats for 18 total vs. +4 to 4 stats for 16 total...)

Sadly, I don't think I'll be investing in either Robin.

Here's my big sales pitch for it:
https://fireemblem.gamepress.gg/q-a/robin-refine-just-handy-get-yours-today

But to be brief, I think it's nothing groundbreaking but it makes Robin just neat unit to have.

With tactics you often have do switch around seals and C skills plus often find a way to replace the rare speed tactic.
Robin's refine is not as potent, but it's all on one slot in an easy package. And robin can go for full support and add in 2 drive skills to be a stat battery to his allies.

For combat... It's just a raven tome with 3 more might. Kinda neat but doesn't change much from the standard raven tome builds.
Not sure about the best IV though (probably atk or def)

Edit: Should also note that it frees up the C and Seal slots of your team as well, since usually you spread the tactic skills around.

For Arena, I love it. Never considered them offensive anyways. Now it won't feel as bad foddering Helbindi since they (arguably) do his job better.

You can stack drives or dual spurs on them and they'll be one of the better buff bots now. Not to mention F.Robin will be an occasionally bonus unit in Arena and AR and can hard counter the Rein~Lyn meta.

I'll put them in Rank 4~5

They're not as good as the ones I had come up with:
https://project-emblem.wikia.com/wiki/Grim_Memory_(Tome)(Obsoleted) &
https://project-emblem.wikia.com/wiki/Grim_Awakening_(Tome)(Obsoleted)

Grim Memory: Blue Tome (Mt 14) - Grants weapon-triangle advantage against foes of colors (red, blue, green, colorless) of allies unit is bonded with and inflicts weapon-triangle disadvantage on foes of that color during combat. (Unit is bonded with all allies adjacent to unit or bonded allies. Can neutralize original weapon-triangle disadvantage, but effect is neutralized if foe has similar effect against unit's color.)

+Effect Refine: Grants weapon-triangle advantage against foes of colors (red, blue, green, colorless) of allies unit is bonded with and inflicts weapon-triangle disadvantage on foes of that color during combat. Unit can counterattack regardless of foe's range. (Unit is bonded with all allies adjacent to unit or bonded allies. Can neutralize original weapon-triangle disadvantage, but effect is neutralized if foe has similar effect against unit's color.)

Grim Awakening: Green Tome (Mt 14) - Effective against foes of types (infantry, armor, cavalry, flier) of allies unit is bonded with. (Unit is bonded with all allies adjacent to unit or bonded allies.)

+Effect Refine: Effective against foes of types (infantry, armor, cavalry, flier) of allies unit is bonded with. Unit can counterattack regardless of foe's range. (Unit is bonded with all allies adjacent to unit or bonded allies.)

They have worked wonders for supporting my Laevatein and Nino. It's just annoying that I can't have a team thats all the same movement type... I don't think they helped the Robins themselves though. So unless someone makes a tier list based on support, I don't think the robins will move up much, if at all, I mean all they got was +3 might and access to a refine.