Garland's successes seem to have come when he was in a position with lots of structure and lots of guidance. In places such as college, Law school, working under senior leadership ... places where there are rules of behavior and where you are never a decision maker. He was a follow-the-leader type guy. He collected lots of honors and lots of accolades probably for prodigious regurgitation of whatever the latest legal thinking was at the time.
He was educated but until he reached the top, he did not have to think. A lot of life is this way.
Once he got the top leadership role in his field, he was expected to be the guy who set up the framework from which everyone took guidance. He has failed miserably at this task.
In fact, he has so disregarded the presumed role of AG, that I think it is fair to say that for the first time in his life, he does not understand it. He does not perceive the magnitude of his influence on the future history of this country, and even on the world.
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He has demonstrated himself to be a very stupid (and for the record and a different thread) a very vindictive individual. He is not up to his current task, and most certainly would not have been a Supreme Court Justice of distinction.
He clearly would have been a dud ... someone who served without any particular insight, but who just kind of filled a slot and wrote a lot of legalese gibberish with no long-term impact on the course of legal thinking in this nation.
A dud!!