If they didn't feel the need to keep making new Cinderella Girls, it would've been better. And yeah, the producer love is kicked into overdrive for every single one of them, too. I like CG, but not where it's going. Their development and gimmicks seem to be heavily influenced by their fans. At this rate, I think they should stop the Cinderella Masters at a good number, maybe 30 or 40, and focus on them. Yeah, fans will be mad that their favorite idol won't be voiced, but it better than making more than they can handle. That way, they can move out of mobage and give them a proper game.
As for the MLs, I like them, I really do. Even though some still annoy me, design-wise. When ML was first introduced, I was kind of skeptical at them adding MORE idols when there were already so many CGs. Them being already apart of 765Pro didn't make much better. But after a while, I began to think "So 765Pr become more popular and attracted more aspiring idols." After that, they didn't bug me. They seem to have much more thought put into them, as ninjamitsuki said, therefore seem more interesting than most CGs, voiced or not.