Suggestions in detail:
> Add another drop-down for the "overall rating" to the reviews-page while using the same value as for the "votes".
> Compile the ratings of each category in the reviews to give "average animation rating", "average sound rating" and so on. Would be useful for any upcoming "similar rated anime"-function.

> Maybe allow some kind of "short review"-feature with just the (detailed) votes without an extra text (to promote using it). If it's already possible to add a review without text, one could change the way they're displayed: All in a row on the reviews-page, maybe already the sum of all, sort them to the bottom.