I am SO glad to find that others find some voices annoying too!
Mine would have to be Samuel from Black Mirror (could he BE more monotone?), and Celeste's father from Keepsake. When I listened to his voice-over I was stunned by just how bad he was.
Others would be Lydia and Mustavio (also from Keepsake).
(I'm sensing a theme here....)
Cat, tossing in her two cents