Oink from Milk was an app that sort of did that. Heres a video demo: https://www.youtube.com/watch?v=5xADESocujo

They unfortunately didn't last to long. Maybe they were to early?

I don't know of any, but seems like a great app idea. People are often looking for best <insert-food-name> in the area as opposed to "best restaurant in the area".

I think maybe people wouldn’t eat something here, other there. And not it’s trouble for people rate restaurants, even menu items

My favorite local Chinese joint is like this though. Some items are home runs and some items are wild pitches into the backstop.

I wanted to build this in 2011, didn't finish.