I really am curious how Dianping evaluates this.
My guess is it's just a random little list that Dianping does every week to encourage new business slash their clients while only showing public's opinions in categories there is no clients of theirs.
For example, restaurant Forward only has 73 reviews and it's the best Sichuan restaurant in Beijing while fellow Chuanban has about 10,000 reviews, not to mention there are restaurants having more reviews than Chuanban.