SS_ShitStorm
IVovacane
Rin was only what? A normal chuunin girl? lol
Also, I doubt Kushina was stronger than the average kunoichi since she probably wasn't allowed to actually fight.
They were both jinchuuriki.
Considering Kabuto was able to bring back fully powered jinchuuriki without their bijuu they'd probably be sufficient to ******** s**t up.
In Rin's case, she was a forced Jinchuuriki, and she died very soon after anyway via Kakashi to the chest. I don't think there's any requirements to become a Jinchuuriki, it's only when they try to control their Jibuu that s**t hits the fan.
And Kushina's clan were adept at Sealing techniques, so she was able to keep the Kyuubi at bay while also avoiding having to control him. So, she cheated.
Regardless, I think they're both highly regarded kunoichi. Rin was trained by Minato and Kushina had strong Taijutsu even as an Academy Student. They might not be as strong as Jounin like Kakashi or Gai, but in a world where ninjas drop dead literally every day, reviving loved ones is a strong enough emotional attack on it's own.