What’s the effect of a clear narrative voice?

A clear narrative voice offers you a voice that the reader can trust - and in some nineteenth century novels narrators can be unreliable like Emily Bronte's Wuthering Heights. Dickens offers us a clear narrative voice so that we are sure of both what is happening and what lessons we are meant to draw from the story. We might questions those from a more modern perspective but we are offered them in a clear manner.