Here’s what Baseball America had to say about him:
Ramirez was lightly recruited and undrafted out of Alhambra (Calif.) High in 2008, but he developed into a top-two-rounds candidate during three stellar seasons at Cal State Fullerton. … Lean and wiry at 6-foot-3, 180 pounds, Ramirez has gotten stronger since high school, increasing his fastball velocity from the 86-88 mph range to the 88-91 range now, peaking at 92-93 early in games. He generally commands his fastball well, but his bread-and-butter is his offspeed stuff. … Ramirez is a fearless competitor with outstanding feel for pitching and one of the best track records in the draft. He has the stuff and makeup to become a mid- to late-rotation starter in the big leagues.