In reply to Justin.

I notice the same thing Justin on my plugins. I think what would be useful is if someone rates 4 or higher they don't have to leave a review. If they rate 3 or less then they are prompted with a box for leaving a review. Why? If someone is rating something low, then they should be required to explain why they rated low so others can see that review to decide whether they think the rating is fair OR the plugin author can see and address as necessary.