When Argonians use shouts they sound human. Please Bethesda fix this. It totally breaks immersion and just messes everything up. Argonians used to be my favorite race in all the games but playing one in Skyrim is just... odd. I've even been considering playing without shouts, but that's just hard :/
They aren't going to hire a voice actor to redo all the shouts just for beast races, your speaking with the dragon soul it should sound the same regardless of race.