If you see someone whose reviews you like, you can follow them. This will cause their reviews to be at the top of any other businesses you look at. Also, you can click on the name of a person whose review you trust to see a list of other places they reviewed.
I think the only things they are missing from what you suggested (just from what I saw in the FAQ) is personalizing the average rating and aggregating information about the people you trust for you.
If you see someone whose reviews you like, you can follow them. This will cause their reviews to be at the top of any other businesses you look at. Also, you can click on the name of a person whose review you trust to see a list of other places they reviewed.
I think the only things they are missing from what you suggested (just from what I saw in the FAQ) is personalizing the average rating and aggregating information about the people you trust for you.
If you want to try to implement something like this (perhaps as a browser extension), their APIs look pretty thorough. (http://www.yelp.com/developers/documentation/v2/business)