There are far worse NPCs than J'zargo, most of which have already been identified in this very thread. I hold a special place in my heart for the Khajit and Argonian NPCs, they're too few and far between imo. It gets tiresome listening to that faux-Schwarzenegger accent the many citizens of Skyrim seem to sport.

On the subject of voices, am I the only person who finds it absolutely magical that Jason Marsden is a commonly heard voice? Every time I encounter one of his characters my subconscious withdraws back to the days that Boy Meets World was still on the air. Good times.