I wouldn't call it the MOST underrated of all time, but Bernie Williams deserved the MVP award in 1998. He was the best player on the best team of all time and finished 7th in MVP voting despite having the same OPS as winner Juan Gonzalez BUT having a much superior OPS+.
Bernie that year: 101 runs, 26 home runs, 97 RBIs, league leading 339 average, 997 OPS and 160 OPS+.
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