Sugar and white rice are on that list and you single out potatoes?

Nutritiondata.self.com has a "completeness score" of 57/100 for potatoes, but only 27/100 for white rice (long grain), and a 0/100 for sugar (which is nothing but empty calories). FWIW, wheat flour is listed as 33/100 so potatoes are the top of the whole list.

Edit: for comparison, Kale (raw) has a "completeness score" of 85/100 and Spinach (cooked) has a 93/100.