Yelp's ratings, reviews, recommendations, and tips aren't very good for food, bars, and things to do. I've always found Foursquare's to be much higher quality.
I think the parent was suggesting that Yelp is good enough. When you have a brand as recognizable as Yelp and viewed as "good enough" then it becomes nearly impossible for a competitor to beat them by simply being better.
You have to be different and I'm not sure what needs to be different about Yelp.
