I have to agree that Shinjiro is probably the worst vocally of them all. But he can sing, it depends on his daily form, I guess.
For me:
Boys
1. Nishi/Naoya
2. Mitsu/Shuta
3. Shinjiro
Girls
1. Misako
2. Chiaki
I find it hard to compare Boys/Girls voices. But I think Chiakis voice is weaker than Misakos. So I have to disagree. Also I really love Naoyas voice.
For dancing I think all the boys are good. They also seem better than the girls, but I think one of the reasons is the girls wearing high heels so often and then the dancing with the boys looks awkward.
That's the performance I love so much. I have no idea who that other guy is, but he harmonizes well with the boys.
I'm finally also addicted to Dream after Dream. Fantastic single from AAA. Who is also releasing that week? Is there a chance for Number 1?