Right out of the gate, I would say the author is being kind by referring to Garland as an "Obama appointee." Garland was a truly repub nominee, chosen by Hatch. Repubs rejected their own nominee for an extreme ideologue, I think it's only fair we clear that up.
Whether or not he's chosen a party over patriotism (which is itself a platitude) could be debatable depending on which party you're a member of, I suppose. Whether or not he has done more to undermine the functioning of govt. is probably also a matter of perspective. Many thought the same of Reid shelving countless bills that came before him.
One things is for sure, McConnell is guilty of the very thing for which he criticized dems only he took it several orders of magnitude further and to suggest that his proudest moment was to shutdown his own party's SCOTUS nominee tells me that this man is divorced from reality.