Julian Saheed praises beta readers as the unsung heroes of literature, and I heartily agree!
Beta readers are there to take a look at our story from the viewpoint of our consumers. They take a much broader look at our writing and provide us with feedback on themes, plots, character development and interactions. They explain to us how our story made them feel, at which points they cried, at which points they laughed. Most importantly, they tell us what they did not like. Their feedback is provided from the mindset of a reader, not the mindset of an editor, whose approach is much more technical. This is precious feedback. Feedback that can help you avoid displeasure in your fans, something we all strive towards.