Gauging the quality of a restaurant or store through star ratings is often just slightly more reliable than picking blindfolded; one undercooked stir fry may tank the ratings for what's otherwise a stellar eatery. In that sense, Foursquare's revamped Explore for iOS users is a long-overdue replacement for an old concept. Rather than let the overly emotional guide our decisions, the update assigns ratings from a 10-point system based on how many people check in, how many are
