The voiceover artist had best be an actor; not necessarily a character actor, though that can help sometimes, but a person who can sound as though they believe what they're talking about.

The trends in voiceover come and go. We went from "smooth and smarmy game-show" sounding people to the latest "don't bother me I'm too cool and tired to deal with you" type voice. We've had the obnoxious "Super Battle of the Monster Trucks" guys and the "I'm so hot and waiting for you" female VO.

I can shout if you make me, but I'd prefer not to.

The key to convincing people to keep listening is to sound as though you mean what you're saying. People can hear liars instantly. I specialize in providing voiceover that is real, not forced; a voice that befriends your audience, so long as you've passed the Bullshit Test. What I mean by that is: if you're lying, I can't lie for you.