That’s somewhat surprising, as I posted a composite ranking from 7 different sources, posting down to the top 50 ( of 150+ total). It included both CSRanking and QS mentioned above, as well as four other sources. Only one of which had fewer than 30 schools ranked.
(As usual, you’ll find the “if it’s not perfect it’s useless, and it’s only perfect if it’s exactly what I want” responses. They are data points to be used appropriately. )