What are the comps for Austin Martin, anyway?
Try to find some MLB players with skill sets like this:
60+ hit tool with good plate discipline
below average game power
weak arm
average speed
not an everyday player at any premium position
The three positive examples I can think of are Adam Frazier, Nick Markakis without the arm and from 2009 on, and Howie Kendrick (but Kendrick was an aggressive hitter).
Maybe Adam Frazier is the best one there.
I guess a lot of hit tool predominant guys like Melky Cabrera could also be comparable.
I think in most instances this is a skill set that will spend a lot of seasons around 2 WAR, unless he can figure out how to lift/drive the ball more or how to be a plus CF/2B.