The criteria has less to do with quality and more to do with Quantity. The ROC is chock full of pizza joints. They are everywhere.
The number of pizza restaurants per capita.
The average price of large cheese and pepperoni pizzas on thousands of pizzeria menus (and how they compare to local incomes).
Clever’s Pizza Passion Score, which reflects Google searches related to pizza in various markets.
A city’s perceived pizza quality, as measured by a poll of 2,000 Americans.