This ties in well with #20, where multiple authors can review the same restaurant.
I imagine there won't be many double reviews yet, so let's just list them in order of submission on the restaurant page.

This feature does beg the question what color we display on the map.
I think it makes the most sense to show the average rating on the circle (over food and value, equally weighted?).
The color could just be the typical color of the rating rounded to the nearest whole number.

Another cool feature would be to provide a toggle to change what the number and color represent, like:

1. lowest rating
2. highest rating
3. average rating