I agree with what others have said about the usefulness of PGR. Granted, PGR reflects how a rather small group of philosophers views departments that practice English-language philosophy. However, that group of philosophers is pretty representative, or slightly more disturbingly, authoritative, of the English-speaking philosophical community at large. PGR is useful in the sense that it makes this representative view (RV) available for anyone's reference. Of course, you might think that RV is biased against certain departments, etc. But that is hardly the fault of PGR, which (presumably) merely reports RV.
As for Leiter himself, well, it's not really a question that's appropriate for discussion on an online forum.