The number of Justices is just luck of the draw; that they got confirmed is impressive (especially Kavanaugh, despite the hearings fiasco) but it’s a much less impressive accomplishment considering the Senate is controlled by Republicans. He’s gotten a massive number of Circuit Court Judges confirmed, which is great. I hadn’t realized how many. Again, the friendly Senate helps, but still.
I’ll wait for us to stop hemorrhaging American blood and taxpayer dollars, by finishing things so our troops can come home before I give Mattis props. He is a good SecDef, and I’m glad he’s there, but is the metric of a great Presidency “he picked a good SecDef”? I mean, that seems like a low bar.
It takes much more than luck to appoint great Supreme Court Justices. I have to respect what he did. He released a list of nominees during the campaign. He picked two names from that list, just like he said he would. That is impressive. Yes having two vacancies was "luck." And yes having a GOP Senate helps. In fact, no way either one of them gets confirmed if Democrats controlled the Senate. That's the hyper-partisan environment we now live in. Go check out the votes for Scalia and Ginsburg. Two at the polar opposite end of the spectrum, but bipartisan support. That will probably never happen again.
Not trying to discount the loss of any American life or the enormous amount of my tax dollars we spend on defense and national security. Part of my point is what we accomplished in Iraq. Recall that Obama inherited a relatively stable Iraq, pulled our troops, lied about why they were pulled, and then ISIS took over the majority of Iraq and got a stronghold in Syria. In less than one year, with Mattis as SecDef, we took back all of the ground we gave up under Obama as a direct result of a change in strategy (changing the rules of engagement, increased troops, etc.).
And yes I think it is a great leadership trait to not only appoint a competent person, but then let that person do his or her job. Remember Clinton and Les Aspen? We lost lives in Somalia because those two were concerned about the perception if we gave the boots on the ground what they needed to win. And remember Bush and General Shinseki? Shinseki said we needed a much larger force in Iraq part II. Bush didn't listen and Shinseki got fired. Chaos was the result.
So while the sum total of a successful presidency isn't the appointment and proper use of a great cabinet secretary, it is a great accomplishment.