I don't understand people bagging on Riho's singing constantly. She's better than the rest, especially at her age.
I wholehartedly agree. When I listen to the concert rips, it's hard for me to tell Riho and Reina apart sometimes. And that's pretty incredible, given that Riho is 13 years old with limited singing experience. And when you see her on stage, she's a born performer. There's no question about that.
Mizuki has a nicer sounding voice than Riho, but lacks the passion and charisma of a class-A performer. I do find her enormously likable, however.