He's a very good minor leaguer. That's the extent of it. As Doug's numbers show... guys with those rates don't stick in the majors. And that's the real crux. He's nothing more (right now) than a glorified AAA star with enormous power potential.
If he starts walking more or continues to strike out much less... then he'll be "very good." Until then, you're looking at a career minor leaguer.