Cecil, Otoya and Ranmaru, and to some extent Camus I can't really enjoy singing. Are people into that? Especially Cecil, jeez.
Man, Cecil kills me because he's one of my favorites but HOO BOY his singing is lousy sometimes. I think he sounds fine when he's singing in a lower voice (like in Destiny Song). Too bad almost every song that features him has him doing the nasally high pitched thing instead.
I'm not too big on Otoya's or Syo's singing either. At least Syo puts so much enthusiasm in his songs that he's always fun to listen to.