Joe has a .363 obp, .128 ISO, and accumulated 1.0 WAR, -9.3 dWAR in 576 plate appearances. Vargas has .355 obp, .260 iso, and accumulated .7 WAR, -3.1dWAR in 155 plate appearances. So nope, Mauer hasn't out performed the alternatives. Getting back to old discussions, I don't know how the Twins hold on to Vargas w/Joe on the roster, but it's clear they need to try. Vargas has been the better option and is going through Arb for the first time.