If you think Sorin's voice is annoying, just imagine it being Shirou Emiya from the Fate series singing since they share the same VA. But instead of Saber, Shirou got Pontiff Xavi as his Servant and became a Xavist.
Oh wait! But... Sorins is a fucking good singer!!! Ouo His voice actor is good! Never forgot my shock to know is the same as Naruto's Sasuke (and Bleach's Ishida...)... despite I had never listened to neither of them... :D