No, she isn't. 45% bonus to healing and ability to heal up to 12 targets across 3 teams are selling points of kage tsunade. If you let her live during 3v3, you're gonna have a bad time. She's still a very good ninja, that with a small ammount of luck can hard carry your bonds arena/ranked/gnw. Whether she's worth the price, I'll leave it for people who have her to say.