Saying Reina cant sing is a total lie.
It's like saying Yuko does age.
Maybe you don't like the sound of her voice or are tired of her voice.
BUT that doesn't mean shes bad.
I used to dislike her for like 2 years but I never said she was a crappy singer. Cuz she isn't.
Edit.
And no, am I saying in anyway she is the best singer Morning Musume。 ever had cuz she isn't.