Choza works well in ranked battle I see someone in my server did Kabuto, Danzo, Chojuro and Choza. When Kabuto's clone dies, Danzo heals and recover chakra so Choza gets buffed up. Then kabuto would continue to heal Choza and buff him up. After many rounds, Choza's attack would be enormous. But outside of ranked battle, i don't think people use him at all.