Sure there are only 3 Yankees in the top 75, but these three are expected to have a major immediate impact once called up.
#4. Philip Hughes
Far more impressive than Hughes' heavy sinker or jaw-dropping curveball is his understanding of pitching; he is the most intelligent phenom in recent memory. Hughes does not give in to any bat, rarely allows free trips to first base, and gets groundballs consistently from the stretch. Hughes is as good as a New York pitching prospect has been in a long time.
#23 Jose Tabata
The phenom has an odd body type but should have enough core strength to be a home run threat down the road.
#52 Humberto Sanchez
Now a Yankee, Sanchez is likely a reliever going forward, and his heavy fastball and big slider should make for one smooth transition.
I don't consider there to be a dearth of talent in the Yankees farm system with people Darrell Rasner and Jeff Karstens making an immediate impact and Melky Cabrera and Robinson Cano becoming stars on the rise.