It depends who is her opponent. The FRS is useful against enemies like Tsunade, Orochimaru, Hidan and Kakuzu. If it hits them, they can't survive it. But they would survive an attack from Temari.
temari cut the raikage to pieces,unless their body is stronger than his own,they get sliced if caught,not even mentioning her forest buster which she was about to use as her trump card and she can spam it now apparently,
in terms of penetrative power,
cast net>rasen shuriken
in terms of destructive power
kiri kiri mae>rasenshuriken
in terms of both combines
kiri kiri mae spam>rasenshuriken.
Temari attacked the Raikage while he didn't have his armor on. Naruto attacked him while he did. Temari's fuuton isn't on the same level as FRS.
Also, if Raikage didn't have Edo Tensei regeneration he wouldn't have survived another. Naruto saw him after he regenerated, thats why he thought it didn't do anything
raiton armour didnt have anything to do with it,fuuton>raiton,his armour would not have saved him if it hit,his body was the defence,not the armour. Her quick beheading dance is stronger than RS as it can bust forests,and she can spam it now,naruto's rasenshuriken cudnt fully engulf cerberus.
Edo had nothing to do with it,it didnt affect him,there was no sign that he regenerated,RS attacks the cells,his blood was said to be as hard as iron,so little needles arent piercing it,the title clearly said Rasenshurikens limit.