Garuda Weapons are weaker than Mog!!

[Jinko]

but since the Ifrit also boosts weaponskills, which can't be determined by DPS and aren't directly affected by delay (Especially when you've got TP song and invigorate) then isn't the value of the Garuda talons diminished?

No because faster hits means more TP, higher accuracy means less misses, It's impossible to tell without parsing it properly.