From Fangraphs. Someone actually suggests watching an Orioles game

Hernandez is one of those divisive prospects who puts up numbers that dwarf his physical abilities. His numbers, especially the strikeout rates, are ridiculous. In 2007, he posted a 10.4 K/9 in High-A ball. Last year, he put up a 10.6 K/9 in Double-A. This year, he's up to 12.46 K/9 in Triple-A. He's consistently been at the top of the league leaderboards in strikeouts at every rung of the ladder.

However, the reaction from scouts has been relatively mild. He was a 16th round pick in 2005, and even with his minor league dominance, Baseball America left him out of the Orioles Top 10 prospects over the winter. The concerns have mostly centered around questionable command of a four seam fastball and a lack of a third pitch. His slider is definitely an out pitch, and it's the reason for his crazy strikeout rate, but heavy reliance on a breaking ball will get scouts talking bullpen very quickly.