To go to fangraphs (which sorts more easily by position), for Shortstops, Hamilton is #9 in the majors by wRC+ (a close cousin of OPS+).
That does not include baserunning. There, fangraphs uses a counting stat. Hamilton is the #3 SS in the majors, despite having 20 fewer games than the other #1-5 guys. So I'm betting if he's somehow pro-rated, he's close to #1.
The bad news is his defense, also measured on fangraphs by counting. There he's 34 out of 38 in the majors (SS with over 100 PAs).
Altogether, that brings him to #22 bWAR in the majors - but much of that is colored by his lack of playing time. If we were to double his PAs and so double his bWAR, he'd be in a cluster with Kim, Seager, and Correra.
He's still a work in progress on both offense and defense, obviously. But he's starting to play himself into a legitimate SS/2B option going forward. I hope in a month we end up with the classic "good problem" of trying to find ABs for a hot hitting group of Hamilton, Valdez, and Grissom.
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Rafaela by contrast has a wRC+ of 63, which translates to a bWAR of zero. Obviously also a work in progress, but I wouldn't want anyone else in center field.