Everytime I order Grubhub/etc - which is like you decreasing quick to never again - I miss Foursquare. Foursquare did exactly what you’re talking about in terms of surfacing new places. But it was friends who were doing the surfacing.
Only downside is it's pretty limited to the yuppie-foodie crowd - like in NYC, once you venture into deeper Brooklyn/Queens/The Bronx, you won't find much on there.