FanGraphs has a sortable stat table in which you can compare first round picks statistically. So let's take a look at how Mark Appel ranked against the eleven other pitchers selected in the 1st Round of the 2013 draft:
IP: 38.0 (3rd)
K/9: 7.82 (9th)
BB/9: 2.13 (3rd)
K:BB: 3.67 (4th)
K%: 20.6% (9th)
BB/9%: 5.6% (2nd)
WHIP: 1.18 (6th)
ERA: 3.79 (9th)
FIP: 2.94 (8th)