The score simply being the number of top sites feels pretty difficult to understand in isolation. For instance, knowing that React has a libscore of 203 doesn't mean much if I don't know both that this is out of one million sites polled and the score of some other library that I might already have a vague mental picture of its popularity (i.e. compared to jQuery's 600k+).

Other than that, very interesting information to sift through.