Matt Harvey is a high maintenance player. His success with the New York Mets came so quick, his Dark Knight persona preceded his huge ego. He started the 2013 All-Star Game and dated supermodels.
Unfortunately, serious injuries have kept him sidelined and at 28, his velocity has slowed enough to alter his effectiveness. His upper 90s fastballs have become 91-92, making his fastball very hittable. However, I do predict he will become a successful setup man this season and beyond.
Harvey was almost traded this offseason, but it was Mickey Callaway and Dave Eiland who convinced Sandy Alderson to keep him.