I agree that the common law is a pretty effective legal system, reflecting the work of smart people adjudicating particular cases, and feedback over time (from competition between courts, reversals, reactions to and enforcement difficulties with judgments, and so forth). I would recommend it over civil law for a charter city importing a legal system.

But that's no reason to exaggerate the underlying mechanisms and virtues. I also think that there is an active tendency in some circles to overhype those virtues, as they are tied to ideological disputes. [Edited to remove political label.]

but your argument seems to be assaulting the strongest part of his argument

Perhaps a strong individual claim, but I didn't see it clearly connected to a conclusion.