Nick Gonzales is kind of sucking right now in High-A. Same draft class as Austin Martin. Actually, most college hitters from the 1st round last year are not doing so well barring Spencer Torkelson. Only Austin Martin, Garrett Mitchell, & Torkelson are even in AA.
So with that in mind, a 128 wRC+ for Martin with a .417 OBP in AA is pretty fantastic. Really the only concerning thing is the lack of power, but I expect him to start roping doubles when he gets more comfortable. The floor for him is really high in my eyes.
edit: My goodness, Austin Martin's college numbers are nutty: Career slashline of .368/.474/.532 in the SEC with more walks than K's. For reference, Bregman in SEC slashed .337/.409/.514.