I agree - Chiyo is a little overpowered, especially considering her age (not something Kishimoto seemed to bother with) and compared to the real series badasses Itachi, Kisame, etc. But that's why we upgrade!
I beat Sasori yesterday on my first try and losing more or less no life. Just destroy the puppets, throw ninjutsu at Sasori, destroy the next puppet...
I can't believe that Sasori 100-Puppets is actually a character. Imagine Crimson Fist and Sasori-100 . . . Then get more characters who can revive. . . maybe Orochimaru or Tobi even. . . Some way to heal, I don't know. :P That sounds ANNOYING. . .
But that's why they're so hard to get! And by the time you get one of them, someone else has the other.
"Everyone gets a shield!" I know people say LOL, but I literally laughed a bit.