Robinson is perhaps the “greatest underrated player” in Major League history.
A two-time Most Valuable Player, and the first to do it in both leagues, Robinson also took home a Triple Crown in 1966, was a twelve time All-Star, finished in the Top-4 in MVP voting outside his two wins, and oh yeah, was also the first African-American Manager in league history.
When he retired as an active player in 1976, Robinson was in the top-5 in so many offensive categories he was in the company of Babe Ruth, Hank Aaron and Willie Mays.
Yet oddly enough, perhaps because of the era he played in, he would get buried in the “all-time greats” conversation in lieu of the aforementioned players along with guys like Ty Cobb, Roberto Clemente and Ted Williams.
I would say he and Stan Musial are the TWO greatest “underrated” players of all-time, and you could arguably throw in others like Al Kaline for good measure.