I work for Foursquare, so I'm obviously biased, but I think Foursquare Explore is a great way to find good places to eat.
https://foursquare.com/explore
Our recommendations are based on 30 million tips (short recommendations, <= 200 characters) left by our users all over the world. They also take into account the popularity of the venue, the likelihood of people leaving tips there, the time of day, the day of week, and many other factors.
If you have a check-in history with foursquare, or if you have friends that use foursquare, we'll make personalized recommendations. We'll recommend things we think you'll like based on your check-in history and your friend's check-in histories, and we'll highlight which of your friends have been to the places we're recommending, and how often.
The product isn't perfect yet, and there are definitely some big deficiencies if you try to use it as a Yelp replacement (notably, foursquare lacks: hours, webpage links, whether they deliver or not, etc). But it's constantly improving, and it's already pretty good.
</shameless plug>