You have any stats handy on him? I think he gets beat on his fastball but I'm guessing.
Just glancing over the charts from his first three starts, it appears that it is the fastball that gets hit the most. The slider looks almost unhittable and batters have had little success against the change. He barely leaves anything up in the strikezone and attacks hitters inside a lot. It looks like the only way to beat him is to get ahead in the count and let him throw something in the upper 8 inches of the strikezone.
EDIT: Natsaddict's graph shows it better than me posting 10 different graphs