One voice I really don't like is the gravelly voice that Ulfberth War-Bear has. It's just so monotonous.
I also hate the snob voice (Nazeem) and the shady merchant (Belethor) voice.
I'm rather amused by the generic Nord voice (Balgruuf) and the raspy old man voice (Olfred Battle-Born). The latter because I always think of Pete and Tigger. --- "We should be taught not to wait for inspiration to start a thing. Action always generates inspiration. Inspiration seldom generates action."