Sean's breakdown is ironic, because every point he makes against MOND also applies to DM theories, particularly given new evidence. I have no problem acknowledging that MOND is inadequate given the data, but apparently it's difficult for DM supporters to similarly acknowledge that DM has been refuted. The core argument for DM rests on a theory (GR) that we already know must be incorrect due to its singularities.

Finally, I'll just note that literally nothing in Sean's post suggests McGaugh's work is "dubious" in the least, so I have no idea where you got that notion.