From Sickles:
Martinez has enormous potential, clearly. For a player to hold his own in Double-A at age 18 is remarkable. But it also makes it harder to get a read on what the player may do in the future. Age-relative-to-league is very important, but it's just one factor. While scouts are unanimous about his tools, no one is quite certain about how his skills are going to develop. Some see him developing into a 30+ homer guy, while some think he'll be more of a high batting average guy with OK power, and some see him developing both.As usual, only time will tell.
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Would I invest a fantasy pick in Martinez? In a long-term keeper league, absolutely. If I was a Mets fan, would I be super-excited about Martinez? Sure. As a general baseball fan I find his case a fascinating one.
I'm pumped to see FMart catch praise from outside the Mets blogsphere. He's an exciting player and we'll be seeing plenty of him patrolling the outfield of Citi Field very soon.